[PATCH v1 3/3] powerpc/code-patching: Optimise patch_memcpy() to 4 byte chunks

[Benjamin Gray]

As we are patching instructions, we can assume the length is a multiple
of 4 and the destination address is aligned.

Atomicity of patching a prefixed instruction is not a concern, as the
original implementation doesn't provide it anyway.

Signed-off-by: Benjamin Gray <bgray at linux.ibm.com>
---
 arch/powerpc/lib/code-patching.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c
index c6633759b509..ed450a32918c 100644
--- a/arch/powerpc/lib/code-patching.c
+++ b/arch/powerpc/lib/code-patching.c
@@ -394,10 +394,10 @@ static int patch_memset32(u32 *addr, u32 val, size_t count)
 	return -EPERM;
 }
 
-static int patch_memcpy(void *dst, void *src, size_t len)
+static int patch_memcpy32(u32 *dst, u32 *src, size_t count)
 {
-	for (void *end = src + len; src < end; dst++, src++)
-		__put_kernel_nofault(dst, src, u8, failed);
+	for (u32 *end = src + count; src < end; dst++, src++)
+		__put_kernel_nofault(dst, src, u32, failed);
 
 	return 0;
 
@@ -424,7 +424,7 @@ static int __patch_instructions(u32 *patch_addr, u32 *code, size_t len, bool rep
 			err = patch_memset32(patch_addr, val, len / 4);
 		}
 	} else {
-		err = patch_memcpy(patch_addr, code, len);
+		err = patch_memcpy32(patch_addr, code, len / 4);
 	}
 
 	smp_wmb();	/* smp write barrier */
-- 
2.44.0