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powerpc/uaccess: Also perform 64 bits copies in unsafe_copy_to_user() on ppc32 

ppc32 has an efficiant 64 bits __put_user(), so also use it in
order to unroll loops more.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/ccc08a16eea682d6fa4acc957ffe34003a8f0844.1615398498.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-03-10 17:57:00 +00:00 committed by Michael Ellerman
parent 6ce56e1ac3
commit c6adc835c6
1 changed files with 3 additions and 3 deletions
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6
arch/powerpc/include/asm/uaccess.h
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@ -494,9 +494,9 @@ do { \
size_t _len = (l); \
int _i; \
\
for (_i = 0; _i < (_len & ~(sizeof(long) - 1)); _i += sizeof(long)) \
unsafe_put_user(*(long*)(_src + _i), (long __user *)(_dst + _i), e); \
if (IS_ENABLED(CONFIG_PPC64) && (_len & 4)) { \
for (_i = 0; _i < (_len & ~(sizeof(u64) - 1)); _i += sizeof(u64)) \
unsafe_put_user(*(u64 *)(_src + _i), (u64 __user *)(_dst + _i), e); \
if (_len & 4) { \
unsafe_put_user(*(u32*)(_src + _i), (u32 __user *)(_dst + _i), e); \
_i += 4; \
} \