From: Vineet Gupta Date: Mon, 3 Feb 2020 19:43:22 +0000 (-0800) Subject: ARC: uaccess: elide unaliged handling if hardware supports X-Git-Tag: v6.6-rc1~56^2~19 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=c8ee610afe654da7276d4aa8ad2bb60ffff6ddfc;p=linux-block.git ARC: uaccess: elide unaliged handling if hardware supports Signed-off-by: Vineet Gupta --- diff --git a/arch/arc/include/asm/uaccess.h b/arch/arc/include/asm/uaccess.h index d2da159bb80a..1e8809ea000a 100644 --- a/arch/arc/include/asm/uaccess.h +++ b/arch/arc/include/asm/uaccess.h @@ -146,8 +146,9 @@ 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; @@ -373,8 +374,9 @@ 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;