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From: Christoph Hellwig <hch@lst.de>
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Subject: reduce latency in __purge_vmap_area_lazy V2
Date: Fri, 18 Nov 2016 14:03:46 +0100
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Hi all,

this is my spin at sorting out the long lock hold times in
__purge_vmap_area_lazy.  It is based on a patch from Joel.

Changes since V1:
 - add vfree_atomic, thanks to Andrey Ryabinin.