Re: [PATCH 3/4] cpuset: Fix unchecked calls to NODEMASK_ALLOC()

[David Rientjes]

On Thu, 17 Feb 2011, Li Zefan wrote:

> Those functions that use NODEMASK_ALLOC() can't propogate errno
> to users, but will fail silently.
> 
> Since all of them are called with cgroup_mutex held, here we use
> a global nodemask_t variable.
> 
> Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx>

I like the idea and the comment is explicit enough that we don't need any 
refcounting to ensure double usage under cgroup_lock.  I think each 
function should be modified to use cpuset_mems directly, though, instead 
of defining local variables that indirectly access it which only serves to 
make this patch smaller.  Then we can ensure that all occurrences of 
cpuset_mems appear within the lock without being concerned about other 
references.
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