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 <>

diff --git a/mm/debug-pagealloc.c b/mm/debug-pagealloc.c
index a4b6d707a31f5f4e459262344bdb1538cce8beab..2618933efdb361d974033380b00e5c86f6c31291 100644 (file)
--- 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--) {