linux-kernel - [PATCH] Fix arch/x86/kernel/cpu/mtrr/main.c build warning

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Date:	Thu, 20 Nov 2008 11:03:21 -0700
From:	"Richard A. Holden III" <aciddeath@...il.com>
To:	linux-next@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] Fix arch/x86/kernel/cpu/mtrr/main.c build warning

Fix
arch/x86/kernel/cpu/mtrr/main.c: In function 'mtrr_bp_init':
arch/x86/kernel/cpu/mtrr/main.c:1364: warning: 'gran_base' may be used uninitialized in this function

gran_base is only used within the if (debug_print) sections of the for loop, so combine both sections
and move the declaration to within if (debug_print). The overhead of to_size_factor may be a consideration
but the compiler should be able to optimize out the multiple calls.

Signed-off-by: Richard A. Holden III <aciddeath@...il.com>
---
 arch/x86/kernel/cpu/mtrr/main.c |   10 +++-------
 1 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index c091d06..b751e3a 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -1360,20 +1360,16 @@ static int __init mtrr_cleanup(unsigned address_bits)
 	memset(min_loss_pfn, 0xff, sizeof(min_loss_pfn));
 	memset(result, 0, sizeof(result));
 	for (gran_size = (1ULL<<16); gran_size < (1ULL<<32); gran_size <<= 1) {
-		char gran_factor;
-		unsigned long gran_base;
-
-		if (debug_print)
-			gran_base = to_size_factor(gran_size >> 10, &gran_factor);
 
 		for (chunk_size = gran_size; chunk_size < (1ULL<<32);
 		     chunk_size <<= 1) {
 			int num_reg;
 
 			if (debug_print) {
-				char chunk_factor;
-				unsigned long chunk_base;
+				char gran_factor, chunk_factor;
+				unsigned long gran_base, chunk_base;
 
+				gran_base = to_size_factor(gran_size >> 10, &gran_factor);
 				chunk_base = to_size_factor(chunk_size>>10, &chunk_factor),
 				printk(KERN_INFO "\n");
 				printk(KERN_INFO "gran_size: %ld%c   chunk_size: %ld%c \n",
-- 
1.5.6.4

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