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

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Message-Id: <20071031203442.7e161692.rdunlap@xenotime.net>
Date:	Wed, 31 Oct 2007 20:34:42 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Avi Kivity <avi@...ranet.com>, 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

On Wed, 24 Oct 2007 20:11:07 +0200 Ingo Molnar wrote:

> 
> * 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

Hi,
I'm still hitting this build error.  Are these 3 patches not yet
merged??

Thanks.

> ------------->
> 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)
>  {
> -

---
~Randy
-
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