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    Subject[PATCH 3.10 50/89] dm btree: silence lockdep lock inversion in dm_btree_del()
    Date
    3.10-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Joe Thornber <ejt@redhat.com>

    commit 1c7518794a3647eb345d59ee52844e8a40405198 upstream.

    Allocate memory using GFP_NOIO when deleting a btree. dm_btree_del()
    can be called via an ioctl and we don't want to recurse into the FS or
    block layer.

    Signed-off-by: Joe Thornber <ejt@redhat.com>
    Signed-off-by: Mike Snitzer <snitzer@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/md/persistent-data/dm-btree.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/md/persistent-data/dm-btree.c
    +++ b/drivers/md/persistent-data/dm-btree.c
    @@ -240,7 +240,7 @@ int dm_btree_del(struct dm_btree_info *i
    int r;
    struct del_stack *s;

    - s = kmalloc(sizeof(*s), GFP_KERNEL);
    + s = kmalloc(sizeof(*s), GFP_NOIO);
    if (!s)
    return -ENOMEM;
    s->tm = info->tm;



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