linux-kernel - [tip:x86/urgent] x86/mm/init.c: Fix devmem_is

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Message-ID: <tip-73e8f3d7e2cb23614d5115703d76d8e54764b641@git.kernel.org>
Date:	Thu, 13 Sep 2012 23:20:38 -0700
From:	tip-bot for T Makphaibulchoke <tmac@...com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	tglx@...utronix.de, tmac@...com
Subject: [tip:x86/urgent] x86/mm/init.c: Fix devmem_is_allowed() off by one

Commit-ID:  73e8f3d7e2cb23614d5115703d76d8e54764b641
Gitweb:     http://git.kernel.org/tip/73e8f3d7e2cb23614d5115703d76d8e54764b641
Author:     T Makphaibulchoke <tmac@...com>
AuthorDate: Tue, 28 Aug 2012 21:21:43 -0600
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 13 Sep 2012 17:35:54 +0200

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@...com>
Acked-by: H. Peter Anvin <hpa@...or.com>
Cc: yinghai@...nel.org
Cc: tiwai@...e.de
Cc: dhowells@...hat.com
Link: http://lkml.kernel.org/r/1346210503-14276-1-git-send-email-tmac@hp.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/mm/init.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index e0e6990..ab1f6a9 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;
--
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