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    Subject[PATCH AUTOSEL for 4.4 26/35] quota: Check for register_shrinker() failure.
    Date
    From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>

    [ Upstream commit 88bc0ede8d35edc969350852894dc864a2dc1859 ]

    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: 1d3d4437eae1 ("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>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    ---
    fs/quota/dquot.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
    index 353ff31dcee1..1cb1d02c5937 100644
    --- a/fs/quota/dquot.c
    +++ b/fs/quota/dquot.c
    @@ -2919,7 +2919,8 @@ 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;
    }
    --
    2.11.0
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