mm/debug-pagealloc.c: use memchr_inv

Use newly introduced memchr_inv() for page verification.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 5 deletions

diff --git a/mm/debug-pagealloc.c b/mm/debug-pagealloc.c
index a4b6d707a31..2618933efdb 100644
--- a/mm/debug-pagealloc.c
+++ b/mm/debug-pagealloc.c
@@ -1,4 +1,5 @@
 #include <linux/kernel.h>
+#include <linux/string.h>
 #include <linux/mm.h>
 #include <linux/page-debug-flags.h>
 #include <linux/poison.h>
@@ -64,11 +65,8 @@ static void check_poison_mem(unsigned char *mem, size_t bytes)
         unsigned char *start;
         unsigned char *end;
 
-        for (start = mem; start < mem + bytes; start++) {
-                if (*start != PAGE_POISON)
-                        break;
-        }
-        if (start == mem + bytes)
+        start = memchr_inv(mem, PAGE_POISON, bytes);
+        if (!start)
                 return;
 
         for (end = mem + bytes - 1; end > start; end--) {