linux-kernel - [PATCH] x86: Recover timer_ack lost in the merge of the NMI watchdog

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Message-ID: <Pine.LNX.4.55.0807111936480.31940@cliff.in.clinika.pl>
Date:	Fri, 11 Jul 2008 19:47:15 +0100 (BST)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] x86: Recover timer_ack lost in the merge of the NMI watchdog

 In the course of the recent unification of the NMI watchdog an assignment
to timer_ack to switch off unnecesary POLL commands to the 8259A in the
case of a watchdog failure has been accidentally removed.  The statement
used to be limited to the 32-bit variation as since the rewrite of the
timer code it has been relevant for the 82489DX only.  This change brings
it back.

Signed-off-by: Maciej W. Rozycki <macro@...ux-mips.org>
---
patch-next-2.6.26-rc9-20080710-nmi-timer_ack-2
diff -up --recursive --new-file linux-next-2.6.26-rc9-20080710.macro/arch/x86/kernel/nmi.c linux-next-2.6.26-rc9-20080710/arch/x86/kernel/nmi.c
--- linux-next-2.6.26-rc9-20080710.macro/arch/x86/kernel/nmi.c	2008-07-11 02:57:31.000000000 +0000
+++ linux-next-2.6.26-rc9-20080710/arch/x86/kernel/nmi.c	2008-07-11 03:20:33.000000000 +0000
@@ -171,6 +171,9 @@ int __init check_nmi_watchdog(void)
 error:
 	if (nmi_watchdog == NMI_IO_APIC && !timer_through_8259)
 		disable_8259A_irq(0);
+#ifdef CONFIG_X86_32
+	timer_ack = 0;
+#endif
 	return -1;
 }

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