This reverts commit 05713082. The idea
to remove __GFP_NOFAIL was opposed by Andrew Morton. Although mm guys do
want to get rid of __GFP_NOFAIL users, opencoding the allocation retry
is even worse.

See emails following
http://www.gossamer-threads.com/lists/linux/kernel/1809153#1809153Signed-off-by: Jan Kara <jack@suse.cz>