Re: [PATCH 1/2] cpusets: restructure the function update_cpumask() and update_nodemask()

[Li Zefan <lizf@cn.fujitsu.com>]

Andrew Morton wrote:
> On Mon, 02 Jun 2008 16:31:05 +0800 Miao Xie <miaox@cn.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@cn.fujitsu.com>
>> Acked-by: Paul Jackson <pj@sgi.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.
> 

That strstrip() should be removed. because cgroup_write_string() already strstrip()ed
the buffer. Paul M's original patch removed that 2 strstrip()s in cpuset.c.

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