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

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Date:	Wed, 5 Jan 2011 14:08:14 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:  74d91e3c6a66359bb754fb5d8a5b54fb6ba2f9a6
Gitweb:     http://git.kernel.org/tip/74d91e3c6a66359bb754fb5d8a5b54fb6ba2f9a6
Author:     Huang Ying <ying.huang@...el.com>
AuthorDate: Tue, 4 Jan 2011 22:38:09 -0500
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 5 Jan 2011 14:22:58 +0100

x86, NMI: Add touch_nmi_watchdog to io_check_error delay

Prevent the long delay in io_check_error making NMI watchdog
timeout.

Signed-off-by: Huang Ying <ying.huang@...el.com>
Signed-off-by: Don Zickus <dzickus@...hat.com>
LKML-Reference: <1294198689-15447-3-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 bb6f041..c76aaca 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -351,9 +351,11 @@ io_check_error(unsigned char reason, struct pt_regs *regs)
 	reason = (reason & 0xf) | 8;
 	outb(reason, 0x61);
 
-	i = 2000;
-	while (--i)
-		udelay(1000);
+	i = 20000;
+	while (--i) {
+		touch_nmi_watchdog();
+		udelay(100);
+	}
 
 	reason &= ~8;
 	outb(reason, 0x61);
--
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