linux-kernel - Re: [PATCH 2/3] cpumask: use new cpus

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Message-ID: <47FBD99A.2080007@sgi.com>
Date:	Tue, 08 Apr 2008 13:46:18 -0700
From:	Mike Travis <travis@....com>
To:	Bert Wesarg <bert.wesarg@...glemail.com>
CC:	Ingo Molnar <mingo@...e.hu>, Paul Jackson <pj@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] cpumask: use new cpus_scnprintf function v3

Bert Wesarg wrote:
> On Tue, Apr 8, 2008 at 8:43 PM, Mike Travis <travis@....com> wrote:
>>  --- linux-2.6.x86.sched.orig/drivers/base/node.c
>>  +++ linux-2.6.x86.sched/drivers/base/node.c
>>  @@ -19,22 +19,34 @@ static struct sysdev_class node_class =
>>   };
>>
>>
>>  -static ssize_t node_read_cpumap(struct sys_device * dev, char * buf)
>>  +static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf)
>>   {
>>         struct node *node_dev = to_node(dev);
>>         node_to_cpumask_ptr(mask, node_dev->sysdev.id);
>>         int len;
>>
>>  -       /* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
>>  -       BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);
>>  +       /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
>>  +       BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
> Is this right, that you switch from MAX_NUMNODES to NR_CPUS?
> 
> Regards
> Bert

It's printing the number of cpus on a node, so the number of nodes is not
important, it's how many cpus can fit on the head of a node... ;-)

Thanks,
Mike
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