From: Andrew Morton <akpm@linux-foundation.org>
Date: Wed, 28 Sep 2011 00:50:17 +0000 (+1000)
Subject: debug-pagealloc-add-support-for-highmem-pages-fix
X-Git-Tag: next-20110929~2^2~154
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f1aad066366371bfdda2d856b7f0065022d6772b;p=karo-tx-linux.git

debug-pagealloc-add-support-for-highmem-pages-fix

remove unneeded preempt_disable/enable

Cc: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <>
---

diff --git a/mm/debug-pagealloc.c b/mm/debug-pagealloc.c
index bda7ed044eb1..7cea557407f4 100644
--- a/mm/debug-pagealloc.c
+++ b/mm/debug-pagealloc.c
@@ -23,14 +23,11 @@ static inline bool page_poison(struct page *page)
 
 static void poison_page(struct page *page)
 {
-	void *addr;
+	void *addr = kmap_atomic(page);
 
-	preempt_disable();
-	addr = kmap_atomic(page);
 	set_page_poison(page);
 	memset(addr, PAGE_POISON, PAGE_SIZE);
 	kunmap_atomic(addr);
-	preempt_enable();
 }
 
 static void poison_pages(struct page *page, int n)
@@ -82,12 +79,10 @@ static void unpoison_page(struct page *page)
 	if (!page_poison(page))
 		return;
 
-	preempt_disable();
 	addr = kmap_atomic(page);
 	check_poison_mem(addr, PAGE_SIZE);
 	clear_page_poison(page);
 	kunmap_atomic(addr);
-	preempt_enable();
 }
 
 static void unpoison_pages(struct page *page, int n)