linux-kernel - Re: [PATCH 6/8] cpumask: Optimize cpumask_of_cpu in lib/smp_processor

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Date:	Fri, 18 Jul 2008 22:35:11 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Travis <travis@....com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	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 6/8] cpumask: Optimize cpumask_of_cpu in
	lib/smp_processor_id.c


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

> hmmm:
> 
> > --- linux-2.6.tip.orig/lib/smp_processor_id.c
> > +++ linux-2.6.tip/lib/smp_processor_id.c
> 
> >  	unsigned long preempt_count = preempt_count();
> >  	int this_cpu = raw_smp_processor_id();
> > -	cpumask_t this_mask;
> > +	cpumask_of_cpu_ptr_declare(this_mask);
> 
> > -	this_mask = cpumask_of_cpu(this_cpu);
> > +	cpumask_of_cpu_ptr_next(this_mask, cpu);
> 
> 'cpu' is not declared ...

commit 06f8d00e9eecb738c99b737ac38a585ea7583ad5
Author: Ingo Molnar <mingo@...e.hu>
Date:   Fri Jul 18 22:34:00 2008 +0200

    cpumask: Optimize cpumask_of_cpu in lib/smp_processor_id.c, fix
    
    fix typo.
    
    Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 lib/smp_processor_id.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/smp_processor_id.c b/lib/smp_processor_id.c
index 9fb2df0..c4381d9 100644
--- a/lib/smp_processor_id.c
+++ b/lib/smp_processor_id.c
@@ -23,7 +23,7 @@ notrace unsigned int debug_smp_processor_id(void)
 	 * Kernel threads bound to a single CPU can safely use
 	 * smp_processor_id():
 	 */
-	cpumask_of_cpu_ptr_next(this_mask, cpu);
+	cpumask_of_cpu_ptr_next(this_mask, this_cpu);
 
 	if (cpus_equal(current->cpus_allowed, *this_mask))
 		goto out;
--
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