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Subject[RFC PATCH 06/11] kernel/locking: Expose mutex_owner()
From
From: Juri Lelli <juri.lelli@redhat.com>

Implementing proxy execution requires that scheduler code be able to
identify the current owner of a mutex. Expose a new helper
mutex_owner() for this purpose.

Signed-off-by: Juri Lelli <juri.lelli@redhat.com>
[Removed the EXPORT_SYMBOL]
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Connor O'Brien <connoro@google.com>
---
include/linux/mutex.h | 2 ++
kernel/locking/mutex.c | 5 +++++
2 files changed, 7 insertions(+)

diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index 8f226d460f51..ebdc59cb0bf6 100644
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -118,6 +118,8 @@ do { \
extern void __mutex_init(struct mutex *lock, const char *name,
struct lock_class_key *key);

+extern struct task_struct *mutex_owner(struct mutex *lock);
+
/**
* mutex_is_locked - is the mutex locked
* @lock: the mutex to be queried
diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c
index f39e9ee3c4d0..325fc9db5004 100644
--- a/kernel/locking/mutex.c
+++ b/kernel/locking/mutex.c
@@ -81,6 +81,11 @@ static inline struct task_struct *__mutex_owner(struct mutex *lock)
return (struct task_struct *)(atomic_long_read(&lock->owner) & ~MUTEX_FLAGS);
}

+struct task_struct *mutex_owner(struct mutex *lock)
+{
+ return __mutex_owner(lock);
+}
+
static inline struct task_struct *__owner_task(unsigned long owner)
{
return (struct task_struct *)(owner & ~MUTEX_FLAGS);
--
2.38.0.rc1.362.ged0d419d3c-goog
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