linux-kernel - Re: [PATCH 3/6] cpuset: convert cpuset_attach() to use cpumask_var

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Message-ID: <4961D10B.5040106@cn.fujitsu.com>
Date:	Mon, 05 Jan 2009 17:21:15 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Ingo Molnar <mingo@...e.hu>, Rusty Russell <rusty@...tcorp.com.au>,
	Mike Travis <travis@....com>, Paul Menage <menage@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/6] cpuset: convert cpuset_attach() to use cpumask_var_t

>>> OK, that works.
>>>
>>> Do we need to dynamically allocate cpus_attach?  Can we just do
>>>
>>> static cpumask_t cpus_attach;
>>>
>>> ?
>>>
>> Yes, it's used by cpuset_attach() only, and cpuset_attach() is called with
>> cgroup_lock() held, so it won't happen that 2 threads access cpus_attach
>> concurrently.
> 
> You misunderstand my question.  I think.
> 
> Can we allocate cpus_attach at compile time?  Completely, not
> partially.  By doing
> 
> static cpumask_t cpus_attach;
> 
> instead of
> 
> static cpumask_var_t cpus_attach;
> ...
> 	alloc_cpumask_var(&cpus_attach, GFP_KERNEL);
> 
> ?

Ah, I misunderstood. Yes a static cpumask_t works, but what Mike Travis and
Rusty is doing is to remove cpumask_t completely, and replace cpumask_t
with cpumask_var_t wherever possible.

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