From: Tejun Heo <tj@kernel.org>
Date: Tue, 2 Sep 2014 18:46:05 +0000 (-0400)
Subject: percpu: make sure chunk->map array has available space
X-Git-Tag: omap-for-v3.19/prcm-cleanup~131^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9c824b6a172c8d44a6b037946bae90127c969b1b;p=pandora-kernel.git

percpu: make sure chunk->map array has available space

An allocation attempt may require extending chunk->map array which
requires GFP_KERNEL context which isn't available for atomic
allocations.  This patch ensures that chunk->map array usually keeps
some amount of available space by directly allocating buffer space
during GFP_KERNEL allocations and scheduling async extension during
atomic ones.  This should make atomic allocation failures from map
space exhaustion rare.

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