linux-kernel - Re: [PATCH] Define smp_call_function

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Message-Id: <20071024074354.9edd4cee.akpm@linux-foundation.org>
Date:	Wed, 24 Oct 2007 07:43:54 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Avi Kivity <avi@...ranet.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	kvm-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	jeff@...zik.org, bunk@...nel.org
Subject: Re: [PATCH] Define smp_call_function_mask() on uniprocessor builds

On Wed, 24 Oct 2007 10:51:25 +0200 Avi Kivity <avi@...ranet.com> wrote:

> Rather than #ifdef users of smp_call_function_mask(), define it as an
> empty macro to avoid build errors.  The function explicitly prohibits
> callers from specifying the current cpu, so nothing needs to be done.
> 
> This unbreaks uniprocessor KVM builds.
> 
> Signed-off-by: Avi Kivity <avi@...ranet.com>
> 
> diff --git a/include/linux/smp.h b/include/linux/smp.h
> index 259a13c..24e2e31 100644
> --- a/include/linux/smp.h
> +++ b/include/linux/smp.h
> @@ -108,6 +108,9 @@ static inline void smp_send_reschedule(int cpu) { }
>  	0;			\
>  })
>  
> +#define smp_call_function_mask(mask, func, info, wait) \
> +	do { (void)(mask); (void)(func); (void)(info); (void)(wait); } while (0)
> +
>  #endif /* !SMP */
>  
>  /*

The real smp_call_function_mask() returns int, so this version should do so
also.

An inlined C function will provide the needed references to the arguments -
no need for those funny (void) thingies.  And it will provide typechecking.


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