linux-kernel - Re: [patch] kvm: fix !SMP build error

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Message-ID: <20071024181107.GA15250@elte.hu>
Date:	Wed, 24 Oct 2007 20:11:07 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Avi Kivity <avi@...ranet.com>
Cc:	Jeff Garzik <jeff@...zik.org>, Adrian Bunk <bunk@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, akpm@...ux-foundation.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [patch] kvm: fix !SMP build error


* Ingo Molnar <mingo@...e.hu> wrote:

> * Ingo Molnar <mingo@...e.hu> wrote:
> 
> > i have triggered this and fixed it the right way - see the patch 
> > below. This fixes the 2.6.24-rc1 build error.
> 
> and this followup patch is needed too if my patch is applied.

plus the patch below is needed too in addition.

	Ingo

------------->
Subject: x86: fix build error in arch/x86/kernel/nmi_32.c
From: Ingo Molnar <mingo@...e.hu>

nmi_cpu_busy() must be available on !SMP too.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/nmi_32.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: linux/arch/x86/kernel/nmi_32.c
===================================================================
--- linux.orig/arch/x86/kernel/nmi_32.c
+++ linux/arch/x86/kernel/nmi_32.c
@@ -53,13 +53,13 @@ static int unknown_nmi_panic_callback(st
 
 static int endflag __initdata = 0;
 
-#ifdef CONFIG_SMP
 /* The performance counters used by NMI_LOCAL_APIC don't trigger when
  * the CPU is idle. To make sure the NMI watchdog really ticks on all
  * CPUs during the test make them busy.
  */
 static __init void nmi_cpu_busy(void *data)
 {
+#ifdef CONFIG_SMP
 	local_irq_enable_in_hardirq();
 	/* Intentionally don't use cpu_relax here. This is
 	   to make sure that the performance counter really ticks,
@@ -69,8 +69,8 @@ static __init void nmi_cpu_busy(void *da
 	   care if they get somewhat less cycles. */
 	while (endflag == 0)
 		mb();
-}
 #endif
+}
 
 static int __init check_nmi_watchdog(void)
 {
-
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