From: Mikulas Patocka <mpatocka@redhat.com>
Date: Wed, 10 Jul 2013 22:41:15 +0000 (+0100)
Subject: dm ioctl: set noio flag to avoid __vmalloc deadlock
X-Git-Tag: v3.11-rc1~20^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1c0e883e86ece31880fac2f84b260545d66a39e0;p=pandora-kernel.git

dm ioctl: set noio flag to avoid __vmalloc deadlock

Set noio flag while calling __vmalloc() because it doesn't fully respect
gfp flags to avoid a possible deadlock (see commit
502624bdad3dba45dfaacaf36b7d83e39e74b2d2).

This should be backported to stable kernels 3.8 and newer. The kernel 3.8
doesn't have memalloc_noio_save(), so we should set and restore process
flag PF_MEMALLOC instead.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
---

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