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quota: Check for register_shrinker() failure. 

register_shrinker() might return -ENOMEM error since Linux 3.12.
Call panic() as with other failure checks in this function if
register_shrinker() failed.

Fixes: 1d3d4437ea ("vmscan: per-node deferred work")
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Jan Kara <jack@suse.com>
Cc: Michal Hocko <mhocko@suse.com>
Reviewed-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Tetsuo Handa 2017-11-29 22:34:50 +09:00 committed by Jan Kara
parent 1a6152d36d
commit 88bc0ede8d
1 changed files with 2 additions and 1 deletions
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3
fs/quota/dquot.c
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@ -2992,7 +2992,8 @@ static int __init dquot_init(void)
pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld,"
" %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order));
register_shrinker(&dqcache_shrinker);
if (register_shrinker(&dqcache_shrinker))
panic("Cannot register dquot shrinker");
return 0;
}