From: Akinobu Mita <akinobu.mita@gmail.com>
Date: Wed, 24 Aug 2011 23:47:05 +0000 (+1000)
Subject: printk_ratelimit() should not be used, because it shares ratelimiting
X-Git-Tag: next-20110913~1^2~71
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5730c7c89d4b8ee1d61d5035689ab43218ea5eca;p=karo-tx-linux.git

printk_ratelimit() should not be used, because it shares ratelimiting
state with all other unrelated printk_ratelimit() callsites.

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

diff --git a/mm/debug-pagealloc.c b/mm/debug-pagealloc.c
index a1e3324de2b5..a4b6d707a31f 100644
--- a/mm/debug-pagealloc.c
+++ b/mm/debug-pagealloc.c
@@ -2,6 +2,7 @@
 #include <linux/mm.h>
 #include <linux/page-debug-flags.h>
 #include <linux/poison.h>
+#include <linux/ratelimit.h>
 
 static inline void set_page_poison(struct page *page)
 {
@@ -59,6 +60,7 @@ static bool single_bit_flip(unsigned char a, unsigned char b)
 
 static void check_poison_mem(unsigned char *mem, size_t bytes)
 {
+	static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 10);
 	unsigned char *start;
 	unsigned char *end;
 
@@ -74,7 +76,7 @@ static void check_poison_mem(unsigned char *mem, size_t bytes)
 			break;
 	}
 
-	if (!printk_ratelimit())
+	if (!__ratelimit(&ratelimit))
 		return;
 	else if (start == end && single_bit_flip(*start, PAGE_POISON))
 		printk(KERN_ERR "pagealloc: single bit error\n");