tree b56dd76ef7c1c0598af5b830e2a3d8f8a38f772b
parent 6c182cd88d179cbbd06f4f8a8a19b6977940753f
author Mikulas Patocka <mpatocka@redhat.com> 1373496075 +0100
committer Alasdair G Kergon <agk@redhat.com> 1373496075 +0100

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>