linux-kernel - [tip:x86/mm] x86/mm/mtrr: Remove incorrect address check in __mtrr_type

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Date:	Mon, 11 May 2015 05:46:14 -0700
From:	tip-bot for Toshi Kani <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	brgerst@...il.com, linux-kernel@...r.kernel.org, bp@...e.de,
	toshi.kani@...com, hpa@...or.com, peterz@...radead.org,
	akpm@...ux-foundation.org, dvlasenk@...hat.com, mcgrof@...e.com,
	torvalds@...ux-foundation.org, bp@...en8.de, linux-mm@...ck.org,
	tglx@...utronix.de, luto@...capital.net, mingo@...nel.org
Subject: [tip:x86/mm] x86/mm/mtrr:
  Remove incorrect address check in __mtrr_type_lookup()

Commit-ID:  cd2f6a5a4704a359635eb34919317052e6a96ba7
Gitweb:     http://git.kernel.org/tip/cd2f6a5a4704a359635eb34919317052e6a96ba7
Author:     Toshi Kani <toshi.kani@...com>
AuthorDate: Mon, 11 May 2015 10:15:52 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 11 May 2015 10:38:44 +0200

x86/mm/mtrr: Remove incorrect address check in __mtrr_type_lookup()

__mtrr_type_lookup() checks MTRR fixed ranges when mtrr_state.have_fixed
is set and start is less than 0x100000.

However, the 'else if (start < 0x1000000)' in the code checks with an
incorrect address as it has an extra-zero in the address.

The code still runs correctly as this check is meaningless, though.

This patch replaces the incorrect address check with 'else' with no
condition.

Signed-off-by: Toshi Kani <toshi.kani@...com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Elliott@...com
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Luis R. Rodriguez <mcgrof@...e.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: dave.hansen@...el.com
Cc: linux-mm <linux-mm@...ck.org>
Cc: pebolle@...cali.nl
Link: http://lkml.kernel.org/r/1427234921-19737-4-git-send-email-toshi.kani@hp.com
Link: http://lkml.kernel.org/r/1431332153-18566-8-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/cpu/mtrr/generic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
index 7d74f7b..5b23967 100644
--- a/arch/x86/kernel/cpu/mtrr/generic.c
+++ b/arch/x86/kernel/cpu/mtrr/generic.c
@@ -137,7 +137,7 @@ static u8 __mtrr_type_lookup(u64 start, u64 end, u64 *partial_end, int *repeat)
 			idx = 1 * 8;
 			idx += ((start - 0x80000) >> 14);
 			return mtrr_state.fixed_ranges[idx];
-		} else if (start < 0x1000000) {
+		} else {
 			idx = 3 * 8;
 			idx += ((start - 0xC0000) >> 12);
 			return mtrr_state.fixed_ranges[idx];
--
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