linux-kernel - [PATCH 18/18] x86/mce: Fix monarch timeout setting through the mce= cmdline option

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Date:	Tue, 26 May 2015 10:28:21 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	X86-ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 18/18] x86/mce: Fix monarch timeout setting through the mce= cmdline option

From: Xie XiuQi <xiexiuqi@...wei.com>

Using "mce=1,10000000" on the kernel cmdline to change the monarch
timeout does not work. The cause is that get_option() does parse a
subsequent comma in the option string and signals that with a return
value. So we don't need to check for a second comma ourselves.

Signed-off-by: Xie XiuQi <xiexiuqi@...wei.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: H. Peter Anvin <hpa@...or.com>
Link: http://lkml.kernel.org/r/1432120943-25028-1-git-send-email-xiexiuqi@huawei.com
Signed-off-by: Borislav Petkov <bp@...e.de>
---
 arch/x86/kernel/cpu/mcheck/mce.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index e535533d5ab8..e6580b9255de 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -2008,11 +2008,8 @@ static int __init mcheck_enable(char *str)
 	else if (!strcmp(str, "bios_cmci_threshold"))
 		cfg->bios_cmci_threshold = true;
 	else if (isdigit(str[0])) {
-		get_option(&str, &(cfg->tolerant));
-		if (*str == ',') {
-			++str;
+		if (get_option(&str, &(cfg->tolerant)) == 2)
 			get_option(&str, &(cfg->monarch_timeout));
-		}
 	} else {
 		pr_info("mce argument %s ignored. Please use /sys\n", str);
 		return 0;
-- 
1.9.0.258.g00eda23

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