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authorJason Low <jason.low2@hpe.com>2016-05-20 15:19:36 -0700
committerIngo Molnar <mingo@kernel.org>2016-06-03 12:06:10 +0200
commit6e2814745c67ab422b86262b05e6f23a56f28aa3 (patch)
tree5e69ae55af787319cca75bf6b767adc0180eaafb /kernel/locking
parentc0fcb6c2d332041256dc55d8a1ec3c0a2d0befb8 (diff)
locking/mutex: Set and clear owner using WRITE_ONCE()
The mutex owner can get read and written to locklessly. Use WRITE_ONCE when setting and clearing the owner field in order to avoid optimizations such as store tearing. This avoids situations where the owner field gets written to with multiple stores and another thread could concurrently read and use a partially written owner value. Signed-off-by: Jason Low <jason.low2@hpe.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Davidlohr Bueso <dave@stgolabs.net> Acked-by: Waiman Long <Waiman.Long@hpe.com> 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: Scott J Norton <scott.norton@hpe.com> Cc: Terry Rudd <terry.rudd@hpe.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1463782776.2479.9.camel@j-VirtualBox Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/locking')
-rw-r--r--kernel/locking/mutex-debug.h4
-rw-r--r--kernel/locking/mutex.h10
2 files changed, 10 insertions, 4 deletions
diff --git a/kernel/locking/mutex-debug.h b/kernel/locking/mutex-debug.h
index 0799fd3e4cfa..372e6530180d 100644
--- a/kernel/locking/mutex-debug.h
+++ b/kernel/locking/mutex-debug.h
@@ -29,12 +29,12 @@ extern void debug_mutex_init(struct mutex *lock, const char *name,
static inline void mutex_set_owner(struct mutex *lock)
{
- lock->owner = current;
+ WRITE_ONCE(lock->owner, current);
}
static inline void mutex_clear_owner(struct mutex *lock)
{
- lock->owner = NULL;
+ WRITE_ONCE(lock->owner, NULL);
}
#define spin_lock_mutex(lock, flags) \
diff --git a/kernel/locking/mutex.h b/kernel/locking/mutex.h
index 5cda397607f2..12f96199441c 100644
--- a/kernel/locking/mutex.h
+++ b/kernel/locking/mutex.h
@@ -17,14 +17,20 @@
__list_del((waiter)->list.prev, (waiter)->list.next)
#ifdef CONFIG_MUTEX_SPIN_ON_OWNER
+/*
+ * The mutex owner can get read and written to locklessly.
+ * We should use WRITE_ONCE when writing the owner value to
+ * avoid store tearing, otherwise, a thread could potentially
+ * read a partially written and incomplete owner value.
+ */
static inline void mutex_set_owner(struct mutex *lock)
{
- lock->owner = current;
+ WRITE_ONCE(lock->owner, current);
}
static inline void mutex_clear_owner(struct mutex *lock)
{
- lock->owner = NULL;
+ WRITE_ONCE(lock->owner, NULL);
}
#else
static inline void mutex_set_owner(struct mutex *lock)