linux-kernel - Re: [PATCH 4/8] cpumask: Optimize cpumask_of_cpu in drivers/misc/sgi-xp/xpc

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Date:	Wed, 16 Jul 2008 06:17:15 -0500
From:	Dean Nelson <dcn@....com>
To:	Mike Travis <travis@....com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/8] cpumask: Optimize cpumask_of_cpu in drivers/misc/sgi-xp/xpc_main.c

On Tue, Jul 15, 2008 at 02:14:33PM -0700, Mike Travis wrote:
>   * Optimize various places where a pointer to the cpumask_of_cpu value
>     will result in reducing stack pressure.
> 
> Based on linux-2.6.tip/master at the following commit:
> 
>     commit 0a91813e16ebd5c2d9b5c2acd5b7c91742112c4f
>     Merge: 9a635fa... 724dce0...
>     Author: Ingo Molnar <mingo@...e.hu>
>     Date:   Tue Jul 15 14:55:17 2008 +0200
> 
> Signed-off-by: Mike Travis <travis@....com>
> Cc: Dean Nelson <dcn@....com>
> ---
>  drivers/misc/sgi-xp/xpc_main.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> --- linux-2.6.tip.orig/drivers/misc/sgi-xp/xpc_main.c
> +++ linux-2.6.tip/drivers/misc/sgi-xp/xpc_main.c
> @@ -229,10 +229,11 @@ xpc_hb_checker(void *ignore)
>  	int last_IRQ_count = 0;
>  	int new_IRQ_count;
>  	int force_IRQ = 0;
> +	cpumask_of_cpu_ptr(cpumask, XPC_HB_CHECK_CPU);
>  
>  	/* this thread was marked active by xpc_hb_init() */
>  
> -	set_cpus_allowed(current, cpumask_of_cpu(XPC_HB_CHECK_CPU));
> +	set_cpus_allowed_ptr(current, cpumask);
>  
>  	/* set our heartbeating to other partitions into motion */
>  	xpc_hb_check_timeout = jiffies + (xpc_hb_check_interval * HZ);
> 

Acked-by: Dean Nelson <dcn@....com>

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