The patch titled
Subject: mm: don't automatically unregister bdis
has been added to the -mm tree. Its filename is
mm-dont-automatically-unregister-bdis.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-dont-automatically-unregister-bdis.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-dont-automatically-unregister-bdis.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
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>
Cc: 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
@@ -972,8 +972,7 @@ 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);
_
Patches currently in -mm which might be from hch@xxxxxx are
mm-dont-include-linux-daxh-in-linux-mempolicyh.patch
mm-export-bdi_unregister.patch
mtd-call-bdi_unregister-explicitly.patch
fs-explicitly-unregister-per-superblock-bdis.patch
mm-dont-automatically-unregister-bdis.patch
mm-simplify-bdi-refcounting.patch
mm-unexport-folio_memcg_unlock.patch
mm-unexport-unlock_page_memcg.patch
