On Tue, 21 Nov 2023 10:54:36 +1100, Michael Ellerman wrote:

Building with GCC 13 (which has -array-bounds enabled) there are several
warnings in sstep.c along the lines of:

  In function ‘do_byte_reverse’,
      inlined from ‘do_vec_load’ at arch/powerpc/lib/sstep.c:691:3,
      inlined from ‘emulate_loadstore’ at arch/powerpc/lib/sstep.c:3439:9:
  arch/powerpc/lib/sstep.c:289:23: error: array subscript 2 is outside array bounds of ‘u8[16]’ {aka ‘unsigned char[16]’} [-Werror=array-bounds=]
    289 |                 up[2] = byterev_8(up[1]);
        |                 ~~~~~~^~~~~~~~~~~~~~~~~~
  arch/powerpc/lib/sstep.c: In function ‘emulate_loadstore’:
  arch/powerpc/lib/sstep.c:681:11: note: at offset 16 into object ‘u’ of size 16
    681 |         } u = {};
        |           ^

[...]

Applied to powerpc/next.

[1/1] powerpc/lib: Avoid array bounds warnings in vec ops
      https://git.kernel.org/powerpc/c/df99da19c6c24ab65052ae1bc0904f99069478d9

cheers