Revert "blk-mq, percpu_ref: implement a kludge for SCSI blk-mq stall during probe"

This reverts commit 0a30288da1aec914e158c2d7a3482a85f632750f, which
was a temporary fix for SCSI blk-mq stall issue.  The following
patches will fix the issue properly by introducing atomic mode to
percpu_ref.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Kent Overstreet <kmo@daterainc.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@lst.de>

1 files changed, 0 insertions, 16 deletions

diff --git a/lib/percpu-refcount.c b/lib/percpu-refcount.c
index c6c31e2829b1..559ee0b20318 100644
--- a/lib/percpu-refcount.c
+++ b/lib/percpu-refcount.c
@@ -189,19 +189,3 @@ void percpu_ref_kill_and_confirm(struct percpu_ref *ref,
         call_rcu_sched(&ref->rcu, percpu_ref_kill_rcu);
 }
 EXPORT_SYMBOL_GPL(percpu_ref_kill_and_confirm);
-
-/*
- * XXX: Temporary kludge to work around SCSI blk-mq stall.  Used only by
- * block/blk-mq.c::blk_mq_freeze_queue().  Will be removed during v3.18
- * devel cycle.  Do not use anywhere else.
- */
-void __percpu_ref_kill_expedited(struct percpu_ref *ref)
-{
-        WARN_ONCE(ref->pcpu_count_ptr & PCPU_REF_DEAD,
-                  "percpu_ref_kill() called more than once on %pf!",
-                  ref->release);
-
-        ref->pcpu_count_ptr |= PCPU_REF_DEAD;
-        synchronize_sched_expedited();
-        percpu_ref_kill_rcu(&ref->rcu);
-}