From 5835d96e9ce4efdba8c6cefffc2f1575925456de Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Tue, 2 Sep 2014 14:46:04 -0400
Subject: [PATCH] percpu: implement [__]alloc_percpu_gfp()

Now that pcpu_alloc_area() can allocate only from populated areas,
it's easy to add atomic allocation support to [__]alloc_percpu().
Update pcpu_alloc() so that it accepts @gfp and skips all the blocking
operations and allocates only from the populated areas if @gfp doesn't
contain GFP_KERNEL.  New interface functions [__]alloc_percpu_gfp()
are added.

While this means that atomic allocations are possible, this isn't
complete yet as there's no mechanism to ensure that certain amount of
populated areas is kept available and atomic allocations may keep
failing under certain conditions.

Signed-off-by: Tejun Heo <tj@kernel.org>
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