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McKenney" To: linux-kernel@vger.kernel.org Cc: mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org, Lance Roy , Ingo Molnar , Will Deacon , "Paul E . McKenney" Subject: [PATCH tip/core/rcu 5/7] locking/mutex: Replace spin_is_locked() with lockdep Date: Sun, 11 Nov 2018 12:04:41 -0800 X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181111200421.GA10551@linux.ibm.com> References: <20181111200421.GA10551@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18111120-0064-0000-0000-000003722FF2 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010028; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000270; SDB=6.01116026; UDB=6.00577118; IPR=6.00896126; MB=3.00024114; MTD=3.00000008; XFM=3.00000015; UTC=2018-11-11 20:04:49 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18111120-0065-0000-0000-00003B4D4939 Message-Id: <20181111200443.10772-5-paulmck@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-11-11_13:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=3 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=617 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1811110191 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Lance Roy lockdep_assert_held() is better suited to checking locking requirements, since it only checks if the current thread holds the lock regardless of whether someone else does. This is also a step towards possibly removing spin_is_locked(). Signed-off-by: Lance Roy Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Will Deacon Signed-off-by: Paul E. McKenney --- kernel/locking/mutex-debug.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/locking/mutex-debug.c b/kernel/locking/mutex-debug.c index 9aa713629387..771d4ca96dda 100644 --- a/kernel/locking/mutex-debug.c +++ b/kernel/locking/mutex-debug.c @@ -36,7 +36,7 @@ void debug_mutex_lock_common(struct mutex *lock, struct mutex_waiter *waiter) void debug_mutex_wake_waiter(struct mutex *lock, struct mutex_waiter *waiter) { - SMP_DEBUG_LOCKS_WARN_ON(!spin_is_locked(&lock->wait_lock)); + lockdep_assert_held(&lock->wait_lock); DEBUG_LOCKS_WARN_ON(list_empty(&lock->wait_list)); DEBUG_LOCKS_WARN_ON(waiter->magic != waiter); DEBUG_LOCKS_WARN_ON(list_empty(&waiter->list)); @@ -51,7 +51,7 @@ void debug_mutex_free_waiter(struct mutex_waiter *waiter) void debug_mutex_add_waiter(struct mutex *lock, struct mutex_waiter *waiter, struct task_struct *task) { - SMP_DEBUG_LOCKS_WARN_ON(!spin_is_locked(&lock->wait_lock)); + lockdep_assert_held(&lock->wait_lock); /* Mark the current thread as blocked on the lock: */ task->blocked_on = waiter; -- 2.17.1