linux-kernel - [PATCH]: x86: Don't check for BIOS corruption in first 64K when there's no need to

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Date:	Fri, 25 Feb 2011 20:31:55 +0000 (UTC)
From:	Naga Chumbalkar <nagananda.chumbalkar@...com>
To:	x86@...nel.org
Cc:	Naga Chumbalkar <nagananda.chumbalkar@...com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>
Subject: [PATCH]: x86: Don't check for BIOS corruption in first 64K when there's no need to

Due to commit 781c5a67f152c17c3e4a9ed9647f8c0be6ea5ae9 it is likely that
the number of areas to scan for BIOS corruption is 0 -- especially when
the first 64K is already reserved (X86_RESERVE_LOW is 64K by default).
If that's the case then don't set up the scan.

Signed-off-by: Naga Chumbalkar <nagananda.chumbalkar@...com>
---
 arch/x86/kernel/check.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/check.c b/arch/x86/kernel/check.c
index 13a3891..a9480e1 100644
--- a/arch/x86/kernel/check.c
+++ b/arch/x86/kernel/check.c
@@ -106,8 +106,9 @@ void __init setup_bios_corruption_check(void)
 		addr += size;
 	}
 
-	printk(KERN_INFO "Scanning %d areas for low memory corruption\n",
-	       num_scan_areas);
+	if (num_scan_areas)
+		printk(KERN_INFO "Scanning %d areas for low memory "
+		       "corruption\n", num_scan_areas);
 }
 
 
@@ -148,7 +149,8 @@ static void check_corruption(struct work_struct *dummy)
 
 static int start_periodic_check_for_corruption(void)
 {
-	if (!memory_corruption_check || corruption_check_period == 0)
+	if (!num_scan_areas || !memory_corruption_check ||
+	    corruption_check_period == 0)
 		return 0;
 
 	printk(KERN_INFO "Scanning for low memory corruption every %d seconds\n",
-- 
1.7.1.2

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