[PATCH v2] selftests/powerpc: Suppress -Wmaybe-uninitialized with GCC 15

[Madhavan Srinivasan]

On Fri, 13 Mar 2026 22:24:26 +0530, Amit Machhiwal wrote:
> GCC 15 reports the below false positive '-Wmaybe-uninitialized' warning
> in vphn_unpack_associativity() when building the powerpc selftests.
> 
>   # make -C tools/testing/selftests TARGETS="powerpc"
>   [...]
>     CC       test-vphn
>   In file included from test-vphn.c:3:
>   In function ‘vphn_unpack_associativity’,
>       inlined from ‘test_one’ at test-vphn.c:371:2,
>       inlined from ‘test_vphn’ at test-vphn.c:399:9:
>   test-vphn.c:10:33: error: ‘be_packed’ may be used uninitialized [-Werror=maybe-uninitialized]
>      10 | #define be16_to_cpup(x)         bswap_16(*x)
>         |                                 ^~~~~~~~
>   vphn.c:42:27: note: in expansion of macro ‘be16_to_cpup’
>      42 |                 u16 new = be16_to_cpup(field++);
>         |                           ^~~~~~~~~~~~
>   In file included from test-vphn.c:19:
>   vphn.c: In function ‘test_vphn’:
>   vphn.c:27:16: note: ‘be_packed’ declared here
>      27 |         __be64 be_packed[VPHN_REGISTER_COUNT];
>         |                ^~~~~~~~~
>   cc1: all warnings being treated as errors
> 
> [...]

Applied to powerpc/next.

[1/1] selftests/powerpc: Suppress -Wmaybe-uninitialized with GCC 15
      https://git.kernel.org/powerpc/c/6e65886fceb23605eff952d6b1975737b4c4b154

cheers