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| author |   Peter Zijlstra <peterz@infradead.org> | 2018-02-20 16:01:36 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2018-02-21 08:56:40 +0100 |
| commit | 88e77dc6a354095ddaaae715bc0d3b55702fa3db (patch) | |
| tree | 203d07a95e41da5b4b415f7117c092c4eb8da20e /include/linux/mutex.h | |
| parent | Linux 4.16-rc2 (diff) | |
| download | linux-dev-88e77dc6a354095ddaaae715bc0d3b55702fa3db.tar.xz linux-dev-88e77dc6a354095ddaaae715bc0d3b55702fa3db.zip | |
locking/mutex: Add comment to __mutex_owner() to deter usage
Attempt to deter usage, this is not a public interface. It is entirely
possible to implement a conformant mutex without having this owner
field (in fact, we used to have that).
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/mutex.h')
| -rw-r--r-- | include/linux/mutex.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/mutex.h b/include/linux/mutex.h index f25c13423bd4..cb3bbed4e633 100644 --- a/include/linux/mutex.h +++ b/include/linux/mutex.h @@ -66,6 +66,11 @@ struct mutex { #endif }; +/* + * Internal helper function; C doesn't allow us to hide it :/ + * + * DO NOT USE (outside of mutex code). + */ static inline struct task_struct *__mutex_owner(struct mutex *lock) { return (struct task_struct *)(atomic_long_read(&lock->owner) & ~0x07); |