Commit c6adc835 authored by Christophe Leroy's avatar Christophe Leroy Committed by Michael Ellerman
Browse files

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: default avatarChristophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/ccc08a16eea682d6fa4acc957ffe34003a8f0844.1615398498.git.christophe.leroy@csgroup.eu
parent 6ce56e1a

arch/powerpc/include/asm/uaccess.h

+3 −3
Original line number Diff line number Diff line
@@ -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;						\

	}								\