linux-kernel - Re: [PATCH 1/2] cpusets: restructure the function update_cpumask() and update

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Date:	Wed, 2 Jul 2008 02:19:08 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	miaox@...fujitsu.com
Cc:	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Paul Jackson <pj@....com>, Paul Menage <menage@...gle.com>
Subject: Re: [PATCH 1/2] cpusets: restructure the function update_cpumask()
 and update_nodemask()

On Mon, 02 Jun 2008 16:31:05 +0800 Miao Xie <miaox@...fujitsu.com> wrote:

> extract two functions from update_cpumask() and update_nodemask().They will be
> used later for updating tasks' cpus_allowed and mems_allowed after CPU/NODE
> offline/online.
> 
> Signed-off-by: Miao Xie <miaox@...fujitsu.com>
> Acked-by: Paul Jackson <pj@....com>

This patch has problems.

kernel/cpuset.c: In function 'cpuset_write_resmask':
kernel/cpuset.c:1374: warning: passing argument 2 of 'update_nodemask' discards qualifiers from pointer target type

Did you not get this warning also?

I don't know how to fix it.  cftype.write_string() requires a const
char* in the third arg, but we then go on to call update_nodemask(),
which does a strstrip() on this allegedly-const char array.

Taking a copy of the string in update_nodemask() would fix things, but
that's pretty lame.

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