[RFC PATCH 01/13] ARC: uaccess: elide unaligned handling if hardware supports

[Sergey Matyukevich]

From: Vineet Gupta <vgupta at kernel.org>

Signed-off-by: Vineet Gupta <vgupta at kernel.org>
---
 arch/arc/include/asm/uaccess.h | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/arc/include/asm/uaccess.h b/arch/arc/include/asm/uaccess.h
index 783bfdb3bfa3..d78aae76831f 100644
--- a/arch/arc/include/asm/uaccess.h
+++ b/arch/arc/include/asm/uaccess.h
@@ -175,8 +175,9 @@ raw_copy_from_user(void *to, const void __user *from, unsigned long n)
 	if (n == 0)
 		return 0;
 
-	/* unaligned */
-	if (((unsigned long)to & 0x3) || ((unsigned long)from & 0x3)) {
+	/* fallback for unaligned access when hardware doesn't support */
+	if (!IS_ENABLED(CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS) &&
+	     (((unsigned long)to & 0x3) || ((unsigned long)from & 0x3))) {
 
 		unsigned char tmp;
 
@@ -402,8 +403,9 @@ raw_copy_to_user(void __user *to, const void *from, unsigned long n)
 	if (n == 0)
 		return 0;
 
-	/* unaligned */
-	if (((unsigned long)to & 0x3) || ((unsigned long)from & 0x3)) {
+	/* fallback for unaligned access when hardware doesn't support */
+	if (!IS_ENABLED(CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS) &&
+	     (((unsigned long)to & 0x3) || ((unsigned long)from & 0x3))) {
 
 		unsigned char tmp;
 
-- 
2.25.1