From: T Makphaibulchoke <tmac@hp.com>
Date: Wed, 29 Aug 2012 03:21:43 +0000 (-0600)
Subject: x86/mm/init.c: Fix devmem_is_allowed() off by one
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=73e8f3d7e2cb23614d5115703d76d8e54764b641;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

x86/mm/init.c: Fix devmem_is_allowed() off by one

Fixing an off-by-one error in devmem_is_allowed(), which allows
accesses to physical addresses 0x100000-0x100fff, an extra page
past 1MB.

Signed-off-by: T Makphaibulchoke <tmac@hp.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Cc: yinghai@kernel.org
Cc: tiwai@suse.de
Cc: dhowells@redhat.com
Link: http://lkml.kernel.org/r/1346210503-14276-1-git-send-email-tmac@hp.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index e0e6990723e9..ab1f6a93b527 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -319,7 +319,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
  */
 int devmem_is_allowed(unsigned long pagenr)
 {
-	if (pagenr <= 256)
+	if (pagenr < 256)
 		return 1;
 	if (iomem_is_exclusive(pagenr << PAGE_SHIFT))
 		return 0;