From: Christoph Hellwig <hch@xxxxxx> Subject: mm: don't automatically unregister bdis All BDI users now unregister explicitly. Link: https://lkml.kernel.org/r/20211021124441.668816-5-hch@xxxxxx Signed-off-by: Christoph Hellwig <hch@xxxxxx> Reviewed-by: Jan Kara <jack@xxxxxxx> Cc: Miquel Raynal <miquel.raynal@xxxxxxxxxxx> Cc: Richard Weinberger <richard@xxxxxx> Cc: Vignesh Raghavendra <vigneshr@xxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/backing-dev.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/mm/backing-dev.c~mm-dont-automatically-unregister-bdis +++ a/mm/backing-dev.c @@ -965,8 +965,7 @@ static void release_bdi(struct kref *ref struct backing_dev_info *bdi = container_of(ref, struct backing_dev_info, refcnt); - if (test_bit(WB_registered, &bdi->wb.state)) - bdi_unregister(bdi); + WARN_ON_ONCE(test_bit(WB_registered, &bdi->wb.state)); WARN_ON_ONCE(bdi->dev); wb_exit(&bdi->wb); kfree(bdi); _
