linux-kernel - [tip:perf/core] x86, NMI: Add touch_nmi_watchdog to io_check

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Message-ID: <tip-3ef3df20bcfa7d271b40ec79ea6db9534ecd1322@git.kernel.org>
Date:	Sat, 16 Oct 2010 16:36:26 GMT
From:	tip-bot for Huang Ying <ying.huang@...el.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, ying.huang@...el.com, hpa@...or.com,
	mingo@...hat.com, tglx@...utronix.de, mingo@...e.hu,
	dzickus@...hat.com
Subject: [tip:perf/core] x86, NMI: Add touch_nmi_watchdog to io_check_error delay

Commit-ID:  3ef3df20bcfa7d271b40ec79ea6db9534ecd1322
Gitweb:     http://git.kernel.org/tip/3ef3df20bcfa7d271b40ec79ea6db9534ecd1322
Author:     Huang Ying <ying.huang@...el.com>
AuthorDate: Fri, 15 Oct 2010 22:22:15 -0400
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sat, 16 Oct 2010 15:01:27 +0200

x86, NMI: Add touch_nmi_watchdog to io_check_error delay

Prevent the long delay in io_check_error triggering a NMI watchdog
timeout.

Signed-off-by: Huang Ying <ying.huang@...el.com>
Signed-off-by: Don Zickus <dzickus@...hat.com>
Cc: andi@...stfloor.org
Cc: robert.richter@....com
Cc: peterz@...radead.org
LKML-Reference: <1287195738-3136-3-git-send-email-dzickus@...hat.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/traps.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index e04e59b..bef859e 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -344,9 +344,11 @@ io_check_error(unsigned char reason, struct pt_regs *regs)
 	reason = (reason & NMI_REASON_CLEAR_MASK) | NMI_REASON_CLEAR_IOCHK;
 	outb(reason, NMI_REASON_PORT);
 
-	i = 2000;
-	while (--i)
-		udelay(1000);
+	i = 20000;
+	while (--i) {
+		touch_nmi_watchdog();
+		udelay(100);
+	}
 
 	reason &= ~NMI_REASON_CLEAR_IOCHK;
 	outb(reason, NMI_REASON_PORT);
--
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