Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull locking updates from Ingo Molnar:
 "Here are the locking changes in this cycle:

   - rwsem unification and simpler micro-optimizations to prepare for
     more intrusive (and more lucrative) scalability improvements in
     v5.3 (Waiman Long)

   - Lockdep irq state tracking flag usage cleanups (Frederic
     Weisbecker)

   - static key improvements (Jakub Kicinski, Peter Zijlstra)

   - misc updates, cleanups and smaller fixes"

* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (26 commits)
  locking/lockdep: Remove unnecessary unlikely()
  locking/static_key: Don't take sleeping locks in __static_key_slow_dec_deferred()
  locking/static_key: Factor out the fast path of static_key_slow_dec()
  locking/static_key: Add support for deferred static branches
  locking/lockdep: Test all incompatible scenarios at once in check_irq_usage()
  locking/lockdep: Avoid bogus Clang warning
  locking/lockdep: Generate LOCKF_ bit composites
  locking/lockdep: Use expanded masks on find_usage_*() functions
  locking/lockdep: Map remaining magic numbers to lock usage mask names
  locking/lockdep: Move valid_state() inside CONFIG_TRACE_IRQFLAGS && CONFIG_PROVE_LOCKING
  locking/rwsem: Prevent unneeded warning during locking selftest
  locking/rwsem: Optimize rwsem structure for uncontended lock acquisition
  locking/rwsem: Enable lock event counting
  locking/lock_events: Don't show pvqspinlock events on bare metal
  locking/lock_events: Make lock_events available for all archs & other locks
  locking/qspinlock_stat: Introduce generic lockevent_*() counting APIs
  locking/rwsem: Enhance DEBUG_RWSEMS_WARN_ON() macro
  locking/rwsem: Add debug check for __down_read*()
  locking/rwsem: Micro-optimize rwsem_try_read_lock_unqueued()
  locking/rwsem: Move rwsem internal function declarations to rwsem-xadd.h
  ...

1 files changed, 4 insertions, 21 deletions

diff --git a/kernel/locking/rwsem.c b/kernel/locking/rwsem.c
index e586f0d03ad3..ccbf18f560ff 100644
--- a/kernel/locking/rwsem.c
+++ b/kernel/locking/rwsem.c
@@ -24,7 +24,6 @@ void __sched down_read(struct rw_semaphore *sem)
         rwsem_acquire_read(&sem->dep_map, 0, 0, _RET_IP_);
 
         LOCK_CONTENDED(sem, __down_read_trylock, __down_read);
-        rwsem_set_reader_owned(sem);
 }
 
 EXPORT_SYMBOL(down_read);
@@ -39,7 +38,6 @@ int __sched down_read_killable(struct rw_semaphore *sem)
                 return -EINTR;
         }
 
-        rwsem_set_reader_owned(sem);
         return 0;
 }
 
@@ -52,10 +50,8 @@ int down_read_trylock(struct rw_semaphore *sem)
 {
         int ret = __down_read_trylock(sem);
 
-        if (ret == 1) {
+        if (ret == 1)
                 rwsem_acquire_read(&sem->dep_map, 0, 1, _RET_IP_);
-                rwsem_set_reader_owned(sem);
-        }
         return ret;
 }
 
@@ -70,7 +66,6 @@ void __sched down_write(struct rw_semaphore *sem)
         rwsem_acquire(&sem->dep_map, 0, 0, _RET_IP_);
 
         LOCK_CONTENDED(sem, __down_write_trylock, __down_write);
-        rwsem_set_owner(sem);
 }
 
 EXPORT_SYMBOL(down_write);
@@ -88,7 +83,6 @@ int __sched down_write_killable(struct rw_semaphore *sem)
                 return -EINTR;
         }
 
-        rwsem_set_owner(sem);
         return 0;
 }
 
@@ -101,10 +95,8 @@ int down_write_trylock(struct rw_semaphore *sem)
 {
         int ret = __down_write_trylock(sem);
 
-        if (ret == 1) {
+        if (ret == 1)
                 rwsem_acquire(&sem->dep_map, 0, 1, _RET_IP_);
-                rwsem_set_owner(sem);
-        }
 
         return ret;
 }
@@ -117,9 +109,7 @@ EXPORT_SYMBOL(down_write_trylock);
 void up_read(struct rw_semaphore *sem)
 {
         rwsem_release(&sem->dep_map, 1, _RET_IP_);
-        DEBUG_RWSEMS_WARN_ON(!((unsigned long)sem->owner & RWSEM_READER_OWNED));
 
-        rwsem_clear_reader_owned(sem);
         __up_read(sem);
 }
 
@@ -131,9 +121,7 @@ EXPORT_SYMBOL(up_read);
 void up_write(struct rw_semaphore *sem)
 {
         rwsem_release(&sem->dep_map, 1, _RET_IP_);
-        DEBUG_RWSEMS_WARN_ON(sem->owner != current);
 
-        rwsem_clear_owner(sem);
         __up_write(sem);
 }
 
@@ -145,9 +133,7 @@ EXPORT_SYMBOL(up_write);
 void downgrade_write(struct rw_semaphore *sem)
 {
         lock_downgrade(&sem->dep_map, _RET_IP_);
-        DEBUG_RWSEMS_WARN_ON(sem->owner != current);
 
-        rwsem_set_reader_owned(sem);
         __downgrade_write(sem);
 }
 
@@ -161,7 +147,6 @@ void down_read_nested(struct rw_semaphore *sem, int subclass)
         rwsem_acquire_read(&sem->dep_map, subclass, 0, _RET_IP_);
 
         LOCK_CONTENDED(sem, __down_read_trylock, __down_read);
-        rwsem_set_reader_owned(sem);
 }
 
 EXPORT_SYMBOL(down_read_nested);
@@ -172,7 +157,6 @@ void _down_write_nest_lock(struct rw_semaphore *sem, struct lockdep_map *nest)
         rwsem_acquire_nest(&sem->dep_map, 0, 0, nest, _RET_IP_);
 
         LOCK_CONTENDED(sem, __down_write_trylock, __down_write);
-        rwsem_set_owner(sem);
 }
 
 EXPORT_SYMBOL(_down_write_nest_lock);
@@ -193,7 +177,6 @@ void down_write_nested(struct rw_semaphore *sem, int subclass)
         rwsem_acquire(&sem->dep_map, subclass, 0, _RET_IP_);
 
         LOCK_CONTENDED(sem, __down_write_trylock, __down_write);
-        rwsem_set_owner(sem);
 }
 
 EXPORT_SYMBOL(down_write_nested);
@@ -208,7 +191,6 @@ int __sched down_write_killable_nested(struct rw_semaphore *sem, int subclass)
                 return -EINTR;
         }
 
-        rwsem_set_owner(sem);
         return 0;
 }
 
@@ -216,7 +198,8 @@ EXPORT_SYMBOL(down_write_killable_nested);
 
 void up_read_non_owner(struct rw_semaphore *sem)
 {
-        DEBUG_RWSEMS_WARN_ON(!((unsigned long)sem->owner & RWSEM_READER_OWNED));
+        DEBUG_RWSEMS_WARN_ON(!((unsigned long)sem->owner & RWSEM_READER_OWNED),
+                                sem);
         __up_read(sem);
 }