linux-kernel - [tip: locking/core] locking/mutex: Fix non debug version of mutex_lock_io

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Date:   Tue, 23 Mar 2021 08:16:05 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        stable@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: locking/core] locking/mutex: Fix non debug version of
 mutex_lock_io_nested()

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     ebdbd41bf2536ac57bf315ce9690245e08c5e506
Gitweb:        https://git.kernel.org/tip/ebdbd41bf2536ac57bf315ce9690245e08c5e506
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Mon, 22 Mar 2021 09:46:13 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 22 Mar 2021 21:43:57 +01:00

locking/mutex: Fix non debug version of mutex_lock_io_nested()

If CONFIG_DEBUG_LOCK_ALLOC=n then mutex_lock_io_nested() maps to
mutex_lock() which is clearly wrong because mutex_lock() lacks the
io_schedule_prepare()/finish() invocations.

Map it to mutex_lock_io().

Fixes: f21860bac05b ("locking/mutex, sched/wait: Fix the mutex_lock_io_nested() define")
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: stable@...r.kernel.org
Link: https://lkml.kernel.org/r/878s6fshii.fsf@nanos.tec.linutronix.de
---
 include/linux/mutex.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index 0cd631a..515cff7 100644
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -185,7 +185,7 @@ extern void mutex_lock_io(struct mutex *lock);
 # define mutex_lock_interruptible_nested(lock, subclass) mutex_lock_interruptible(lock)
 # define mutex_lock_killable_nested(lock, subclass) mutex_lock_killable(lock)
 # define mutex_lock_nest_lock(lock, nest_lock) mutex_lock(lock)
-# define mutex_lock_io_nested(lock, subclass) mutex_lock(lock)
+# define mutex_lock_io_nested(lock, subclass) mutex_lock_io(lock)
 #endif
 
 /*