lockdep: Let lock_is_held_type() detect recursive read as read
authorSebastian Andrzej Siewior <bigeasy@linutronix.de>
Fri, 3 Sep 2021 08:40:01 +0000 (10:40 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 18 Nov 2021 18:16:23 +0000 (19:16 +0100)
commitc401830b0125c30740da5784c3489d449a987572
treef2cd23f425a663ae288eaad49101e35a83aa89d2
parent255c569eeb468224c907a12438cc849bb124ef30
lockdep: Let lock_is_held_type() detect recursive read as read

[ Upstream commit 2507003a1d10917c9158077bf6030719d02c941e ]

lock_is_held_type(, 1) detects acquired read locks. It only recognized
locks acquired with lock_acquire_shared(). Read locks acquired with
lock_acquire_shared_recursive() are not recognized because a `2' is
stored as the read value.

Rework the check to additionally recognise lock's read value one and two
as a read held lock.

Fixes: e918188611f07 ("locking: More accurate annotations for read_lock()")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Boqun Feng <boqun.feng@gmail.com>
Acked-by: Waiman Long <longman@redhat.com>
Link: https://lkml.kernel.org/r/20210903084001.lblecrvz4esl4mrr@linutronix.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
kernel/locking/lockdep.c