On Tue, Feb 13, 2018 at 12:58:51PM +0000, Will Deacon wrote: > This patch resolves the livelock by not taking hlist_bl_lock in > d_alloc_parallel if the sequence counter is odd, since any subsequent > masked comparison with i_dir_seq will fail anyway. > > Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx> > Signed-off-by: Will Deacon <will.deacon@xxxxxxx> Reviewed-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx> I wonder whether it makes sense to turn i_dir_seq into a seqcount_t, which would give us the lockdep checking as well.
