Re: [PATCH] selftests/rseq: fix kselftest Clang build warnings

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On 9/26/23 13:02, Mathieu Desnoyers wrote:
On 9/26/23 08:20, Justin Stitt wrote:
Ping.

Looking to get this patch and [1] slated for 6.7 which fixes some
kselftest builds on older kernels.

On Wed, Sep 13, 2023 at 6:03 AM Justin Stitt <justinstitt@xxxxxxxxxx> wrote:

When building with Clang, I am getting many warnings from the selftests/rseq tree.

Here's one such example from rseq tree:
|  param_test.c:1234:10: error: address argument to atomic operation must be a pointer to _Atomic type ('intptr_t *' (aka 'long *') invalid)
|   1234 |         while (!atomic_load(&args->percpu_list_ptr)) {}
|        |                 ^           ~~~~~~~~~~~~~~~~~~~~~~
|  /usr/local/google/home/justinstitt/repos/tc-build/build/llvm/final/lib/clang/18/include/stdatomic.h:140:29: note: expanded from macro 'atomic_load'
|    140 | #define atomic_load(object) __c11_atomic_load(object, __ATOMIC_SEQ_CST)
|        |                             ^                 ~~~~~~

Use compiler builtins `__atomic_load_n()` and `__atomic_store_n()` with
accompanying __ATOMIC_ACQUIRE and __ATOMIC_RELEASE, respectively. This
will fix the warnings because the compiler builtins do not expect their
arguments to have _Atomic type. This should also make TSAN happier.

Link: https://github.com/ClangBuiltLinux/linux/issues/1698
Link: https://github.com/ClangBuiltLinux/continuous-integration2/issues/61
Suggested-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Signed-off-by: Justin Stitt <justinstitt@xxxxxxxxxx>

Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>

Peter, should this go through tip ?

Shuah, should to go through selftests ?


I can take this through selftests and apply it - hoping there
are no conflicts with what's in Peter's tree.

thanks,
-- Shuah




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