Re: next-20250915: error[E0425]: cannot find function `atomic_read_acquire` in crate `bindings`

[Naresh Kamboju <naresh.kamboju@linaro.org>]

On Tue, 16 Sept 2025 at 11:17, Naresh Kamboju <naresh.kamboju@linaro.org> wrote:
>
> The following build warnings / errors noticed on the arm arm64 and x86_64
> with rust config build on the Linux next-20250915 tag.
>
> First seen on next-20250915
> Good: next-20250912
> Bad: next-20250915
>
> Regression Analysis:
> - New regression? yes
> - Reproducibility? yes
>
> * arm, build
>   - rustclang-lkftconfig-kselftest
>   - rustgcc-lkftconfig-kselftest
>
> * arm64, build
>   - rustclang-lkftconfig-kselftest
>   - rustgcc-lkftconfig-kselftest
>
> * x86_64, build
>   - rustgcc-lkftconfig-kselftest
>   - rustclang-nightly-lkftconfig-kselftest
>
> Build regression: next-20250915: error[E0425]: cannot find function
> `atomic_read_acquire` in crate `bindings`

Anders bisected this build regressions and found,

# first bad commit:
 [eb57133305f61b612252382d0c1478bba7f57b67]
 rust: sync: Add basic atomic operation mapping framework

>
> Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
>
> ## Build log
> error[E0425]: cannot find function `atomic_read_acquire` in crate `bindings`
>    --> rust/kernel/sync/atomic/internal.rs:124:37
>     |
> 124 |                   $unsafe { bindings::[< $ctype _ $func >]($($c_arg,)*) }
>     |                                       ^^^^^^^^^^^^^^^^^^^^ not
> found in `bindings`
> ...
> 201 | / declare_and_impl_atomic_methods!(
> 202 | |     /// Basic atomic operations
> 203 | |     pub trait AtomicBasicOps {
> 204 | |         /// Atomic read (load).
> ...   |
> 216 | | );
>     | |_- in this macro invocation
>     |
>     = note: this error originates in the macro `impl_atomic_method`
> which comes from the expansion of the macro
> `declare_and_impl_atomic_methods` (in Nightly builds, run with -Z
> macro-backtrace for more info)
> error: aborting due to 34 previous errors
>
> For more information about this error, try `rustc --explain E0425`.
> make[3]: *** [rust/Makefile:553: rust/kernel.o] Error 1
>
>
> ## Source
> * Kernel version: 6.17.0-rc6
> * Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git
> * Git describe: 6.17.0-rc6-next-20250915
> * Git commit: c3067c2c38316c3ef013636c93daa285ee6aaa2e
> * Architectures: arm, arm64 and x86_64
> * Toolchains: gcc (Debian 15.2.0-3) 15.2.0
> * Kconfigs: rust config
>
> ## Build
> * Build log: https://qa-reports.linaro.org/api/testruns/29894207/log_file/
> * Build details:
> https://regressions.linaro.org/lkft/linux-next-master/next-20250915/build/rustgcc-lkftconfig-kselftest/
> * Build plan: https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/builds/32l4UDzp0FMtS73JeG3kWpcoQrm
> * Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/32l4UDzp0FMtS73JeG3kWpcoQrm/
> * Kernel config:
> https://storage.tuxsuite.com/public/linaro/lkft/builds/32l4UDzp0FMtS73JeG3kWpcoQrm/config
>
> --
> Linaro LKFT

- Naresh