powerpc/lib: Use patch_site to patch copy_32 functions once cache is enabled
The symbol memcpy_nocache_branch defined in order to allow patching of memset function once cache is enabled leads to confusing reports by perf tool. Using the new patch_site functionality solves this issue. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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