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

diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 78e2a3990eab30c8c7aeac12914f9ea7f3b52308..2c09cff205efbf87ad28973194aa7900574a4e7b 100644 (file)
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -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;                                                \
        }                                                               \