rust/kernel/kunit.rs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
Starting with upstream Rust commit a5e3a3f9b6bd ("move
`manual_c_str_literals` to complexity"), to be released in Rust 1.83.0
[1], Clippy now warns on `manual_c_str_literals` by default, e.g.:
error: manually constructing a nul-terminated string
--> rust/kernel/kunit.rs:21:13
|
21 | b"\x013%pA\0".as_ptr() as _,
| ^^^^^^^^^^^^^ help: use a `c""` literal: `c"\x013%pA"`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_c_str_literals
= note: `-D clippy::manual-c-str-literals` implied by `-D warnings`
= help: to override `-D warnings` add `#[allow(clippy::manual_c_str_literals)]`
Apply the suggestion to clean up the warnings.
Link: https://github.com/rust-lang/rust-clippy/pull/13263 [1]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
The cast could also be cleaned up, but that is already done in Gary's
FFI series, so I didn't include another patch.
C-string literals are available since Rust 1.77.0, which is higher than
our minimum version, but LTS kernels do not have Rust 1.77.0. But
perhaps for these is not a big deal, and we could also enable
`feature(c_str_literals)` instead.
rust/kernel/kunit.rs | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/rust/kernel/kunit.rs b/rust/kernel/kunit.rs
index 0ba77276ae7e..824da0e9738a 100644
--- a/rust/kernel/kunit.rs
+++ b/rust/kernel/kunit.rs
@@ -18,7 +18,7 @@ pub fn err(args: fmt::Arguments<'_>) {
#[cfg(CONFIG_PRINTK)]
unsafe {
bindings::_printk(
- b"\x013%pA\0".as_ptr() as _,
+ c"\x013%pA".as_ptr() as _,
&args as *const _ as *const c_void,
);
}
@@ -34,7 +34,7 @@ pub fn info(args: fmt::Arguments<'_>) {
#[cfg(CONFIG_PRINTK)]
unsafe {
bindings::_printk(
- b"\x016%pA\0".as_ptr() as _,
+ c"\x016%pA".as_ptr() as _,
&args as *const _ as *const c_void,
);
}
base-commit: 570172569238c66a482ec3eb5d766cc9cf255f69
--
2.46.2On Fri, Sep 27, 2024 at 6:44 PM Miguel Ojeda <ojeda@kernel.org> wrote:
>
> Starting with upstream Rust commit a5e3a3f9b6bd ("move
> `manual_c_str_literals` to complexity"), to be released in Rust 1.83.0
> [1], Clippy now warns on `manual_c_str_literals` by default, e.g.:
>
> error: manually constructing a nul-terminated string
> --> rust/kernel/kunit.rs:21:13
> |
> 21 | b"\x013%pA\0".as_ptr() as _,
> | ^^^^^^^^^^^^^ help: use a `c""` literal: `c"\x013%pA"`
> |
> = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_c_str_literals
> = note: `-D clippy::manual-c-str-literals` implied by `-D warnings`
> = help: to override `-D warnings` add `#[allow(clippy::manual_c_str_literals)]`
>
> Apply the suggestion to clean up the warnings.
>
> Link: https://github.com/rust-lang/rust-clippy/pull/13263 [1]
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Applied to `rust-fixes` -- thanks everyone!
Cheers,
Miguel
On Fri, Sep 27, 2024 at 12:44 PM Miguel Ojeda <ojeda@kernel.org> wrote:
>
> Starting with upstream Rust commit a5e3a3f9b6bd ("move
> `manual_c_str_literals` to complexity"), to be released in Rust 1.83.0
> [1], Clippy now warns on `manual_c_str_literals` by default, e.g.:
>
> error: manually constructing a nul-terminated string
> --> rust/kernel/kunit.rs:21:13
> |
> 21 | b"\x013%pA\0".as_ptr() as _,
> | ^^^^^^^^^^^^^ help: use a `c""` literal: `c"\x013%pA"`
> |
> = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_c_str_literals
> = note: `-D clippy::manual-c-str-literals` implied by `-D warnings`
> = help: to override `-D warnings` add `#[allow(clippy::manual_c_str_literals)]`
>
> Apply the suggestion to clean up the warnings.
>
> Link: https://github.com/rust-lang/rust-clippy/pull/13263 [1]
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Trevor Gross <tmgross@umich.edu>
On Fri, 27 Sep 2024 18:44:14 +0200
Miguel Ojeda <ojeda@kernel.org> wrote:
> Starting with upstream Rust commit a5e3a3f9b6bd ("move
> `manual_c_str_literals` to complexity"), to be released in Rust 1.83.0
> [1], Clippy now warns on `manual_c_str_literals` by default, e.g.:
>
> error: manually constructing a nul-terminated string
> --> rust/kernel/kunit.rs:21:13
> |
> 21 | b"\x013%pA\0".as_ptr() as _,
> | ^^^^^^^^^^^^^ help: use a `c""` literal: `c"\x013%pA"`
> |
> = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_c_str_literals
> = note: `-D clippy::manual-c-str-literals` implied by `-D warnings`
> = help: to override `-D warnings` add `#[allow(clippy::manual_c_str_literals)]`
>
> Apply the suggestion to clean up the warnings.
>
> Link: https://github.com/rust-lang/rust-clippy/pull/13263 [1]
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
> ---
> The cast could also be cleaned up, but that is already done in Gary's
> FFI series, so I didn't include another patch.
Note that the cast actually need to be re-introduced instead of
cleaned-up -- `c"".as_ptr()` returns `core::ffi::c_char` which might be
signed, while after my series `*const u8` is expected by `printf`.
An alternative is to use `c_str!(...).as_char_ptr()` which will
guarantee the type is what we expected.
Best,
Gary
>
> C-string literals are available since Rust 1.77.0, which is higher than
> our minimum version, but LTS kernels do not have Rust 1.77.0. But
> perhaps for these is not a big deal, and we could also enable
> `feature(c_str_literals)` instead.
>
> rust/kernel/kunit.rs | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/rust/kernel/kunit.rs b/rust/kernel/kunit.rs
> index 0ba77276ae7e..824da0e9738a 100644
> --- a/rust/kernel/kunit.rs
> +++ b/rust/kernel/kunit.rs
> @@ -18,7 +18,7 @@ pub fn err(args: fmt::Arguments<'_>) {
> #[cfg(CONFIG_PRINTK)]
> unsafe {
> bindings::_printk(
> - b"\x013%pA\0".as_ptr() as _,
> + c"\x013%pA".as_ptr() as _,
> &args as *const _ as *const c_void,
> );
> }
> @@ -34,7 +34,7 @@ pub fn info(args: fmt::Arguments<'_>) {
> #[cfg(CONFIG_PRINTK)]
> unsafe {
> bindings::_printk(
> - b"\x016%pA\0".as_ptr() as _,
> + c"\x016%pA".as_ptr() as _,
> &args as *const _ as *const c_void,
> );
> }
>
> base-commit: 570172569238c66a482ec3eb5d766cc9cf255f69
> --
> 2.46.2
On Sat, Sep 28, 2024 at 8:36 PM Gary Guo <gary@garyguo.net> wrote: > > Note that the cast actually need to be re-introduced instead of > cleaned-up -- `c"".as_ptr()` returns `core::ffi::c_char` which might be > signed, while after my series `*const u8` is expected by `printf`. Ah, right, in your series `bindgen` will point to the new one while the method will return the `core::ffi` one which might be still `i8` in some targets. It would be nice to get a way to modify the target for `u8`, i.e. `-Cunsigned-char` or a "target modifier" or similar. Added an entry with some links in our `rustc` list at https://github.com/Rust-for-Linux/linux/issues/355. Cheers, Miguel
On 27.09.24 18:44, Miguel Ojeda wrote:
> Starting with upstream Rust commit a5e3a3f9b6bd ("move
> `manual_c_str_literals` to complexity"), to be released in Rust 1.83.0
> [1], Clippy now warns on `manual_c_str_literals` by default, e.g.:
>
> error: manually constructing a nul-terminated string
> --> rust/kernel/kunit.rs:21:13
> |
> 21 | b"\x013%pA\0".as_ptr() as _,
> | ^^^^^^^^^^^^^ help: use a `c""` literal: `c"\x013%pA"`
> |
> = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_c_str_literals
> = note: `-D clippy::manual-c-str-literals` implied by `-D warnings`
> = help: to override `-D warnings` add `#[allow(clippy::manual_c_str_literals)]`
>
> Apply the suggestion to clean up the warnings.
>
> Link: https://github.com/rust-lang/rust-clippy/pull/13263 [1]
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Benno Lossin <benno.lossin@proton.me>
> ---
> The cast could also be cleaned up, but that is already done in Gary's
> FFI series, so I didn't include another patch.
>
> C-string literals are available since Rust 1.77.0, which is higher than
I thought our minimal version is 1.78.0, or am I misunderstanding the
wording here (I interpret higher as "1.77 > min-version").
---
Cheers,
Benno
> our minimum version, but LTS kernels do not have Rust 1.77.0. But
> perhaps for these is not a big deal, and we could also enable
> `feature(c_str_literals)` instead.
>
> rust/kernel/kunit.rs | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/rust/kernel/kunit.rs b/rust/kernel/kunit.rs
> index 0ba77276ae7e..824da0e9738a 100644
> --- a/rust/kernel/kunit.rs
> +++ b/rust/kernel/kunit.rs
> @@ -18,7 +18,7 @@ pub fn err(args: fmt::Arguments<'_>) {
> #[cfg(CONFIG_PRINTK)]
> unsafe {
> bindings::_printk(
> - b"\x013%pA\0".as_ptr() as _,
> + c"\x013%pA".as_ptr() as _,
> &args as *const _ as *const c_void,
> );
> }
> @@ -34,7 +34,7 @@ pub fn info(args: fmt::Arguments<'_>) {
> #[cfg(CONFIG_PRINTK)]
> unsafe {
> bindings::_printk(
> - b"\x016%pA\0".as_ptr() as _,
> + c"\x016%pA".as_ptr() as _,
> &args as *const _ as *const c_void,
> );
> }
>
> base-commit: 570172569238c66a482ec3eb5d766cc9cf255f69
> --
> 2.46.2
On Fri, Sep 27, 2024 at 7:06 PM Benno Lossin <benno.lossin@proton.me> wrote: > > I thought our minimal version is 1.78.0, or am I misunderstanding the > wording here (I interpret higher as "1.77 > min-version"). Yeah, sorry, I meant that our minimum is higher and thus we can use the feature in mainline, but not in LTSs -- rewording artifact :) Cheers, Miguel
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