[PATCH mm] kasan, powerpc: Don't rename memintrinsics if compiler adds prefixes

[Andrew Morton]

On Mon, 27 Feb 2023 10:47:27 +0100 Marco Elver <elver at google.com> wrote:

> With appropriate compiler support [1], KASAN builds use __asan prefixed
> meminstrinsics, and KASAN no longer overrides memcpy/memset/memmove.
> 
> If compiler support is detected (CC_HAS_KASAN_MEMINTRINSIC_PREFIX),
> define memintrinsics normally (do not prefix '__').
> 
> On powerpc, KASAN is the only user of __mem functions, which are used to
> define instrumented memintrinsics. Alias the normal versions for KASAN
> to use in its implementation.
> 
> Link: https://lore.kernel.org/all/20230224085942.1791837-1-elver@google.com/ [1]
> Link: https://lore.kernel.org/oe-kbuild-all/202302271348.U5lvmo0S-lkp@intel.com/
> Reported-by: kernel test robot <lkp at intel.com>
> Signed-off-by: Marco Elver <elver at google.com>

Seems this is a fix against "kasan: treat meminstrinsic as builtins in
uninstrumented files", so I'll plan to fold this patch into that patch.