From: Roger Pau Monne <roger.pau@citrix.com>
Date: Mon, 18 Mar 2013 16:49:35 +0000 (+0100)
Subject: xen-blkfront: pre-allocate pages for requests
X-Git-Tag: v3.9-rc5~3^2~9^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9c1e050caeb4d1250f8ceef1180a8b3d0db6c624;p=pandora-kernel.git

xen-blkfront: pre-allocate pages for requests

This prevents us from having to call alloc_page while we are preparing
the request. Since blkfront was calling alloc_page with a spinlock
held we used GFP_ATOMIC, which can fail if we are requesting a lot of
pages since it is using the emergency memory pools.

Allocating all the pages at init prevents us from having to call
alloc_page, thus preventing possible failures.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: xen-devel@lists.xen.org
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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