On Wed, 17 Oct 2012, KOSAKI Motohiro wrote:
> > Um, this was just changed to a mutex last week in commit b22d127a39dd
> > ("mempolicy: fix a race in shared_policy_replace()") so that sp_alloc()
> > can be done with GFP_KERNEL, so I didn't consider reverting that behavior.
> > Are you nacking that patch, which you acked, now?
>
> Yes, sadly. /proc usage is a corner case issue. It's not worth to
> strike main path.
It also simplifies the fastpath since we can now unconditionally drop the
reference.
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