diff options
| -rw-r--r-- | lib/string.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/lib/string.c b/lib/string.c index 77bd0b1d3296..b2de45a581f4 100644 --- a/lib/string.c +++ b/lib/string.c @@ -29,6 +29,7 @@ #include <linux/errno.h> #include <linux/slab.h> +#include <asm/unaligned.h> #include <asm/byteorder.h> #include <asm/word-at-a-time.h> #include <asm/page.h> @@ -935,6 +936,21 @@ __visible int memcmp(const void *cs, const void *ct, size_t count) const unsigned char *su1, *su2; int res = 0; +#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS + if (count >= sizeof(unsigned long)) { + const unsigned long *u1 = cs; + const unsigned long *u2 = ct; + do { + if (get_unaligned(u1) != get_unaligned(u2)) + break; + u1++; + u2++; + count -= sizeof(unsigned long); + } while (count >= sizeof(unsigned long)); + cs = u1; + ct = u2; + } +#endif for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--) if ((res = *su1 - *su2) != 0) break; |