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

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Date:	Sun, 7 Jun 2015 10:39:04 -0700
From:	tip-bot for Xie XiuQi <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	xiexiuqi@...wei.com, linux-kernel@...r.kernel.org,
	dvlasenk@...hat.com, tglx@...utronix.de, peterz@...radead.org,
	luto@...capital.net, mingo@...nel.org, hpa@...or.com, bp@...en8.de,
	brgerst@...il.com, tony.luck@...el.com,
	torvalds@...ux-foundation.org, bp@...e.de
Subject: [tip:x86/core] x86/mce:
  Fix monarch timeout setting through the mce= cmdline option

Commit-ID:  5c31b2800d8d3e735e5ecac8fc13d1cf862fd330
Gitweb:     http://git.kernel.org/tip/5c31b2800d8d3e735e5ecac8fc13d1cf862fd330
Author:     Xie XiuQi <xiexiuqi@...wei.com>
AuthorDate: Tue, 26 May 2015 10:28:21 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 27 May 2015 14:39:14 +0200

x86/mce: Fix monarch timeout setting through the mce= cmdline option

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>
Signed-off-by: Borislav Petkov <bp@...e.de>
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: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Tony Luck <tony.luck@...el.com>
Link: http://lkml.kernel.org/r/1432120943-25028-1-git-send-email-xiexiuqi@huawei.com
Link: http://lkml.kernel.org/r/1432628901-18044-19-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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 521e501..0cbcd31 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -2014,11 +2014,8 @@ 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;
--
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