The patch titled
mmotm: fix hang at startup
has been removed from the -mm tree. Its filename was
writeback-split-inode_wb_list_lock-into-bdi_writebacklist_lock-fix.patch
This patch was dropped because it was folded into writeback-split-inode_wb_list_lock-into-bdi_writebacklist_lock.patch
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: mmotm: fix hang at startup
From: Hugh Dickins <hughd@xxxxxxxxxx>
Yesterday's mmotm hangs at startup, and with lockdep it reports:
BUG: spinlock recursion on CPU#1, blkid/284 - with bdi_lock_two()
called from bdev_inode_switch_bdi() in the backtrace. It appears
that this function is sometimes called with new the same as old.
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Acked-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxxxxxxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Cc: Itaru Kitayama <kitayama@xxxxxxxxxxxxx>
Cc: Minchan Kim <minchan.kim@xxxxxxxxx>
Cc: Nick Piggin <npiggin@xxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/block_dev.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN fs/block_dev.c~writeback-split-inode_wb_list_lock-into-bdi_writebacklist_lock-fix fs/block_dev.c
--- a/fs/block_dev.c~writeback-split-inode_wb_list_lock-into-bdi_writebacklist_lock-fix
+++ a/fs/block_dev.c
@@ -57,6 +57,8 @@ static void bdev_inode_switch_bdi(struct
{
struct backing_dev_info *old = inode->i_data.backing_dev_info;
+ if (dst == old)
+ return;
bdi_lock_two(&old->wb, &dst->wb);
spin_lock(&inode->i_lock);
inode->i_data.backing_dev_info = dst;
_
Patches currently in -mm which might be from hughd@xxxxxxxxxx are
writeback-split-inode_wb_list_lock-into-bdi_writebacklist_lock.patch
writeback-split-inode_wb_list_lock-into-bdi_writebacklist_lock-fix-fix.patch
writeback-split-inode_wb_list_lock-into-bdi_writebacklist_lock-fix-fix-fix.patch
prio_tree-debugging-patch.patch
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