linux-kernel - Re: [PATCH] x86/mtrr: fix compiling warning

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Date:	Fri, 19 Sep 2008 09:16:29 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/mtrr: fix compiling warning


* Yinghai Lu <yhlu.kernel@...il.com> wrote:

> Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>

thx - applied the earlier version below already.

	Ingo

------------>
>From 279b0bbba2bb647348ad90e183b3960aa99eccfd Mon Sep 17 00:00:00 2001
From: Yinghai Lu <yhlu.kernel@...il.com>
Date: Thu, 18 Sep 2008 23:55:27 -0700
Subject: [PATCH] x86: fix arch/x86/kernel/cpu/mtrr/main.c warning

fix this warning reported by Andrew Morton:

> arch/x86/kernel/cpu/mtrr/main.c: In function 'mtrr_bp_init':
> arch/x86/kernel/cpu/mtrr/main.c:1170: warning: 'extra_remove_base' may be used uninitialized in this function

the warning is bogus but the logic that prevents uninitialized use
is a bit convoluted so simplify it all.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/cpu/mtrr/main.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index b117d7f..8a7c792 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -1218,11 +1218,10 @@ static int __init mtrr_cleanup(unsigned address_bits)
 
 	memset(range, 0, sizeof(range));
 	extra_remove_size = 0;
-	if (mtrr_tom2) {
-		extra_remove_base = 1 << (32 - PAGE_SHIFT);
+	extra_remove_base = 1 << (32 - PAGE_SHIFT);
+	if (mtrr_tom2)
 		extra_remove_size =
 			(mtrr_tom2 >> PAGE_SHIFT) - extra_remove_base;
-	}
 	nr_range = x86_get_mtrr_mem_range(range, 0, extra_remove_base,
 					  extra_remove_size);
 	range_sums = sum_ranges(range, nr_range);
--
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