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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/ Link: https://lkml.kernel.org/r/20230227094726.3833247-1-elver@google.com Signed-off-by: Marco Elver <elver@google.com> Reported-by: kernel test robot <lkp@intel.com> Acked-by: Michael Ellerman <mpe@ellerman.id.au> [powerpc] Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Daniel Axtens <dja@axtens.net> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Liam R. Howlett <Liam.Howlett@oracle.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>