From: Tejun Heo <tj@kernel.org>
Date: Tue, 2 Sep 2014 18:46:02 +0000 (-0400)
Subject: percpu: move region iterations out of pcpu_[de]populate_chunk()
X-Git-Tag: omap-for-v3.19/prcm-cleanup~131^2~30
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a93ace487a339dccf7040be7fee08c3415188e14;p=pandora-kernel.git

percpu: move region iterations out of pcpu_[de]populate_chunk()

Previously, pcpu_[de]populate_chunk() were called with the range which
may contain multiple target regions in it and
pcpu_[de]populate_chunk() iterated over the regions.  This has the
benefit of batching up cache flushes for all the regions; however,
we're planning to add more bookkeeping logic around [de]population to
support atomic allocations and this delegation of iterations gets in
the way.

This patch moves the region iterations out of
pcpu_[de]populate_chunk() into its callers - pcpu_alloc() and
pcpu_reclaim() - so that we can later add logic to track more states
around them.  This change may make cache and tlb flushes more frequent
but multi-region [de]populations are rare anyway and if this actually
becomes a problem, it's not difficult to factor out cache flushes as
separate callbacks which are directly invoked from percpu.c.

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