rust: kernel: Mark rust_fmt_argument as extern "C" by sulix · Pull Request #967 · Rust-for-Linux/linux

bjorn3

approved these changes Feb 14, 2023

@ojeda ojeda mentioned this pull request

Feb 14, 2023

71 tasks

@sulix

The rust_fmt_argument function is called from printk() to handle the %pA
format specifier.

Since it's called from C, we should mark it extern "C" to make sure it's
ABI compatible.

Cc: stable@vger.kernel.org
Fixes: 247b365 ("rust: add `kernel` crate")
Signed-off-by: David Gow <davidgow@google.com>

@sulix sulix changed the base branch from rust-fixes to rust

February 14, 2023 22:56

ojeda pushed a commit that referenced this pull request

Feb 15, 2023
The rust_fmt_argument function is called from printk() to handle the %pA
format specifier.

Since it's called from C, we should mark it extern "C" to make sure it's
ABI compatible.

Cc: stable@vger.kernel.org
Fixes: 247b365 ("rust: add `kernel` crate")
Signed-off-by: David Gow <davidgow@google.com>
Link: #967
Reviewed-by: Björn Roy Baron <bjorn3_gh@protonmail.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
[Applied `rustfmt`]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

@sulix sulix mentioned this pull request

Feb 16, 2023

mairacanal pushed a commit to mairacanal/linux that referenced this pull request

Mar 2, 2023
The rust_fmt_argument function is called from printk() to handle the %pA
format specifier.

Since it's called from C, we should mark it extern "C" to make sure it's
ABI compatible.

Cc: stable@vger.kernel.org
Fixes: 247b365 ("rust: add `kernel` crate")
Signed-off-by: David Gow <davidgow@google.com>
Link: Rust-for-Linux#967
Reviewed-by: Björn Roy Baron <bjorn3_gh@protonmail.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
[Applied `rustfmt`]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

matthewtgilbride pushed a commit to matthewtgilbride/linux that referenced this pull request

Mar 7, 2023
This lockdep splat says it better than I could:

================================
WARNING: inconsistent lock state
6.2.0-rc2-07010-ga9b9500ffaac-dirty Rust-for-Linux#967 Not tainted
--------------------------------
inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
kworker/1:3/179 [HC0[0]:SC0[0]:HE1:SE1] takes:
ffff3ec4036ce098 (_xmit_ETHER#2){+.?.}-{3:3}, at: netif_freeze_queues+0x5c/0xc0
{IN-SOFTIRQ-W} state was registered at:
  _raw_spin_lock+0x5c/0xc0
  sch_direct_xmit+0x148/0x37c
  __dev_queue_xmit+0x528/0x111c
  ip6_finish_output2+0x5ec/0xb7c
  ip6_finish_output+0x240/0x3f0
  ip6_output+0x78/0x360
  ndisc_send_skb+0x33c/0x85c
  ndisc_send_rs+0x54/0x12c
  addrconf_rs_timer+0x154/0x260
  call_timer_fn+0xb8/0x3a0
  __run_timers.part.0+0x214/0x26c
  run_timer_softirq+0x3c/0x74
  __do_softirq+0x14c/0x5d8
  ____do_softirq+0x10/0x20
  call_on_irq_stack+0x2c/0x5c
  do_softirq_own_stack+0x1c/0x30
  __irq_exit_rcu+0x168/0x1a0
  irq_exit_rcu+0x10/0x40
  el1_interrupt+0x38/0x64
irq event stamp: 7825
hardirqs last  enabled at (7825): [<ffffdf1f7200cae4>] exit_to_kernel_mode+0x34/0x130
hardirqs last disabled at (7823): [<ffffdf1f708105f0>] __do_softirq+0x550/0x5d8
softirqs last  enabled at (7824): [<ffffdf1f7081050c>] __do_softirq+0x46c/0x5d8
softirqs last disabled at (7811): [<ffffdf1f708166e0>] ____do_softirq+0x10/0x20

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(_xmit_ETHER#2);
  <Interrupt>
    lock(_xmit_ETHER#2);

 *** DEADLOCK ***

3 locks held by kworker/1:3/179:
 #0: ffff3ec400004748 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x1f4/0x6c0
 #1: ffff80000a0bbdc8 ((work_completion)(&priv->tx_onestep_tstamp)){+.+.}-{0:0}, at: process_one_work+0x1f4/0x6c0
 #2: ffff3ec4036cd438 (&dev->tx_global_lock){+.+.}-{3:3}, at: netif_tx_lock+0x1c/0x34

Workqueue: events enetc_tx_onestep_tstamp
Call trace:
 print_usage_bug.part.0+0x208/0x22c
 mark_lock+0x7f0/0x8b0
 __lock_acquire+0x7c4/0x1ce0
 lock_acquire.part.0+0xe0/0x220
 lock_acquire+0x68/0x84
 _raw_spin_lock+0x5c/0xc0
 netif_freeze_queues+0x5c/0xc0
 netif_tx_lock+0x24/0x34
 enetc_tx_onestep_tstamp+0x20/0x100
 process_one_work+0x28c/0x6c0
 worker_thread+0x74/0x450
 kthread+0x118/0x11c

but I'll say it anyway: the enetc_tx_onestep_tstamp() work item runs in
process context, therefore with softirqs enabled (i.o.w., it can be
interrupted by a softirq). If we hold the netif_tx_lock() when there is
an interrupt, and the NET_TX softirq then gets scheduled, this will take
the netif_tx_lock() a second time and deadlock the kernel.

To solve this, use netif_tx_lock_bh(), which blocks softirqs from
running.

Fixes: 7294380 ("enetc: support PTP Sync packet one-step timestamping")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Link: https://lore.kernel.org/r/20230112105440.1786799-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

ojeda added a commit to ojeda/linux that referenced this pull request

Jun 5, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

Thus enable it.

In some cases, we need to use the Rust ABI even with `#[no_mangle]`,
and for that, one may use `extern "Rust"` explicitly, but `rustfmt`
overwrites it (and there is no option to prevent that, not even
`force_explicit_abi` [3]). Therefore, use an `allow` instead for
the few cases we had.

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux#967 [2]
Link: https://rust-lang.github.io/rustfmt/?version=v1.5.2&search=force_explicit_abi#force_explicit_abi [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

ojeda added a commit to ojeda/linux that referenced this pull request

Jun 5, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In some cases, we need to use the Rust ABI even with `#[no_mangle]`,
and for that, one may use `extern "Rust"` explicitly, but `rustfmt`
overwrites it (and there is no option to prevent that, not even
`force_explicit_abi` [3]). Therefore, use an `allow` instead for
the few cases we had.

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux#967 [2]
Link: https://rust-lang.github.io/rustfmt/?version=v1.5.2&search=force_explicit_abi#force_explicit_abi [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

ojeda added a commit to ojeda/linux that referenced this pull request

Jun 5, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In some cases, we need to use the Rust ABI even with `#[no_mangle]`,
and for that, one may use `extern "Rust"` explicitly, but `rustfmt`
overwrites it (and there does not seem to be an option to prevent
that: `force_explicit_abi` does not allow to control that part,
and even if it did, or if there was another option, we may not use
it, since so far we have been using the defaults). Therefore, use
`allow`s instead for the few cases we had.

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux#967 [2]
Link: https://rust-lang.github.io/rustfmt/?version=v1.5.2&search=force_explicit_abi#force_explicit_abi [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

ojeda added a commit to ojeda/linux that referenced this pull request

Jun 21, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In some cases, we need to use the Rust ABI even with `#[no_mangle]`,
and for that, one may use `extern "Rust"` explicitly, but `rustfmt`
overwrites it (and there does not seem to be an option to prevent
that: `force_explicit_abi` does not allow to control that part,
and even if it did, or if there was another option, we may not use
it, since so far we have been using the defaults). Therefore, use
`allow`s instead for the few cases we had.

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux#967 [2]
Link: https://rust-lang.github.io/rustfmt/?version=v1.5.2&search=force_explicit_abi#force_explicit_abi [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

ojeda added a commit to ojeda/linux that referenced this pull request

Jun 21, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In some cases, we need to use the Rust ABI even with `#[no_mangle]`,
and for that, one may use `extern "Rust"` explicitly, but `rustfmt`
overwrites it (and there does not seem to be an option to prevent
that: `force_explicit_abi` does not allow to control that part,
and even if it did, or if there was another option, we may not use
it, since so far we have been using the defaults). Therefore, use
`allow`s instead for the few cases we had.

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux#967 [2]
Link: https://rust-lang.github.io/rustfmt/?version=v1.5.2&search=force_explicit_abi#force_explicit_abi [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

ojeda added a commit to ojeda/linux that referenced this pull request

Jun 21, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In some cases, we need to use the Rust ABI even with `#[no_mangle]`,
and for that, one may use `extern "Rust"` explicitly, but `rustfmt`
overwrites it (and there does not seem to be an option to prevent
that: `force_explicit_abi` does not allow to control that part,
and even if it did, or if there was another option, we may not use
it, since so far we have been using the defaults). Therefore, use
`allow`s instead for the few cases we had.

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux#967 [2]
Link: https://rust-lang.github.io/rustfmt/?version=v1.5.2&search=force_explicit_abi#force_explicit_abi [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

ojeda added a commit to ojeda/linux that referenced this pull request

Jun 21, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In some cases, we need to use the Rust ABI even with `#[no_mangle]`,
and for that, one may use `extern "Rust"` explicitly, but `rustfmt`
overwrites it (and there does not seem to be an option to prevent
that: `force_explicit_abi` does not allow to control that part,
and even if it did, or if there was another option, we may not use
it, since so far we have been using the defaults). Therefore, use
`allow`s instead for the few cases we had.

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux#967 [2]
Link: https://rust-lang.github.io/rustfmt/?version=v1.5.2&search=force_explicit_abi#force_explicit_abi [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

intel-lab-lkp pushed a commit to intel-lab-lkp/linux that referenced this pull request

Jul 29, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

fbq pushed a commit that referenced this pull request

Jul 31, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: #967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Link: https://lore.kernel.org/r/20230729220317.416771-2-ojeda@kernel.org

ojeda added a commit that referenced this pull request

Aug 14, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: #967 [2]
Link: rust-lang/rustfmt#5701 [3]
Reviewed-by: Trevor Gross <tmgross@umich.edu>
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Link: https://lore.kernel.org/r/20230729220317.416771-2-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Aug 16, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Aug 16, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Aug 16, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Aug 17, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Aug 18, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Aug 23, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Aug 27, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Aug 27, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Aug 27, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Aug 31, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Sep 2, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Sep 2, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Sep 7, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Sep 7, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Sep 14, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Sep 14, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Sep 20, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Sep 24, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

vtta pushed a commit to vtta/linux-archive that referenced this pull request

Sep 29, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Reviewed-by: Trevor Gross <tmgross@umich.edu>
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Link: https://lore.kernel.org/r/20230729220317.416771-2-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Oct 6, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Oct 10, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Oct 11, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Oct 20, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Oct 20, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Nov 2, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Nov 2, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Nov 9, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Nov 14, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

herrnst pushed a commit to herrnst/linux-asahi that referenced this pull request

Nov 18, 2023
Introduced in Rust 1.69.0 [1], this lint prevents forgetting to set
the C ABI when using `#[no_mangle]` (or thinking it is implied).

For instance, it would have prevented the issue [2] fixed by commit
c682e4c ("rust: kernel: Mark rust_fmt_argument as extern "C"").

    error: `#[no_mangle]` set on a function with the default (`Rust`) ABI
      --> rust/kernel/print.rs:21:1
       |
    21 | / unsafe fn rust_fmt_argument(
    22 | |     buf: *mut c_char,
    23 | |     end: *mut c_char,
    24 | |     ptr: *const c_void,
    25 | | ) -> *mut c_char {
       | |________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_mangle_with_rust_abi
       = note: requested on the command line with `-D clippy::no-mangle-with-rust-abi`
    help: set an ABI
       |
    21 | unsafe extern "C" fn rust_fmt_argument(
       |        ++++++++++
    help: or explicitly set the default
       |
    21 | unsafe extern "Rust" fn rust_fmt_argument(
       |        +++++++++++++

Thus enable it.

In rare cases, we may need to use the Rust ABI even with `#[no_mangle]`
(e.g. one case, before 1.71.0, would have been the `__rust_*`
functions). In those cases, we would need to `#[allow(...)]` the lint,
since using `extern "Rust"` explicitly (as the compiler suggests)
currently gets overwritten by `rustfmt` [3].

Link: rust-lang/rust-clippy#10347 [1]
Link: Rust-for-Linux/linux#967 [2]
Link: rust-lang/rustfmt#5701 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>