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

Browse Source 
Pull locking updates from Ingo Molnar:
 "The main changes in this cycle were:

   - A comprehensive rewrite of the robust/PI futex code's exit handling
     to fix various exit races. (Thomas Gleixner et al)

   - Rework the generic REFCOUNT_FULL implementation using
     atomic_fetch_* operations so that the performance impact of the
     cmpxchg() loops is mitigated for common refcount operations.

     With these performance improvements the generic implementation of
     refcount_t should be good enough for everybody - and this got
     confirmed by performance testing, so remove ARCH_HAS_REFCOUNT and
     REFCOUNT_FULL entirely, leaving the generic implementation enabled
     unconditionally. (Will Deacon)

   - Other misc changes, fixes, cleanups"

* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (27 commits)
  lkdtm: Remove references to CONFIG_REFCOUNT_FULL
  locking/refcount: Remove unused 'refcount_error_report()' function
  locking/refcount: Consolidate implementations of refcount_t
  locking/refcount: Consolidate REFCOUNT_{MAX,SATURATED} definitions
  locking/refcount: Move saturation warnings out of line
  locking/refcount: Improve performance of generic REFCOUNT_FULL code
  locking/refcount: Move the bulk of the REFCOUNT_FULL implementation into the <linux/refcount.h> header
  locking/refcount: Remove unused refcount_*_checked() variants
  locking/refcount: Ensure integer operands are treated as signed
  locking/refcount: Define constants for saturation and max refcount values
  futex: Prevent exit livelock
  futex: Provide distinct return value when owner is exiting
  futex: Add mutex around futex exit
  futex: Provide state handling for exec() as well
  futex: Sanitize exit state handling
  futex: Mark the begin of futex exit explicitly
  futex: Set task::futex_state to DEAD right after handling futex exit
  futex: Split futex_mm_release() for exit/exec
  exit/exec: Seperate mm_release()
  futex: Replace PF_EXITPIDONE with a state
  ...
This commit is contained in:
Linus Torvalds
2019-11-26 16:02:40 -08:00
parent 1ae78780ed 500543c53a
commit 168829ad09
56 changed files with 688 additions and 718 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
tools/lib/lockdep/include/liblockdep/common.h
View File

@@ -42,8 +42,7 @@ void lockdep_init_map(struct lockdep_map *lock, const char *name,
void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
int trylock, int read, int check,
struct lockdep_map *nest_lock, unsigned long ip);
void lock_release(struct lockdep_map *lock, int nested,
unsigned long ip);
void lock_release(struct lockdep_map *lock, unsigned long ip);
void lockdep_reset_lock(struct lockdep_map *lock);
void lockdep_register_key(struct lock_class_key *key);
void lockdep_unregister_key(struct lock_class_key *key);

2
tools/lib/lockdep/include/liblockdep/mutex.h
View File

@@ -42,7 +42,7 @@ static inline int liblockdep_pthread_mutex_lock(liblockdep_pthread_mutex_t *lock
static inline int liblockdep_pthread_mutex_unlock(liblockdep_pthread_mutex_t *lock)
{
lock_release(&lock->dep_map, 0, (unsigned long)_RET_IP_);
lock_release(&lock->dep_map, (unsigned long)_RET_IP_);
return pthread_mutex_unlock(&lock->mutex);
}

2
tools/lib/lockdep/include/liblockdep/rwlock.h
View File

@@ -44,7 +44,7 @@ static inline int liblockdep_pthread_rwlock_rdlock(liblockdep_pthread_rwlock_t *
static inline int liblockdep_pthread_rwlock_unlock(liblockdep_pthread_rwlock_t *lock)
{
lock_release(&lock->dep_map, 0, (unsigned long)_RET_IP_);
lock_release(&lock->dep_map, (unsigned long)_RET_IP_);
return pthread_rwlock_unlock(&lock->rwlock);
}

16
tools/lib/lockdep/preload.c
View File

@@ -270,7 +270,7 @@ int pthread_mutex_lock(pthread_mutex_t *mutex)
*/
r = ll_pthread_mutex_lock(mutex);
if (r)
lock_release(&__get_lock(mutex)->dep_map, 0, (unsigned long)_RET_IP_);
lock_release(&__get_lock(mutex)->dep_map, (unsigned long)_RET_IP_);
return r;
}
@@ -284,7 +284,7 @@ int pthread_mutex_trylock(pthread_mutex_t *mutex)
lock_acquire(&__get_lock(mutex)->dep_map, 0, 1, 0, 1, NULL, (unsigned long)_RET_IP_);
r = ll_pthread_mutex_trylock(mutex);
if (r)
lock_release(&__get_lock(mutex)->dep_map, 0, (unsigned long)_RET_IP_);
lock_release(&__get_lock(mutex)->dep_map, (unsigned long)_RET_IP_);
return r;
}
@@ -295,7 +295,7 @@ int pthread_mutex_unlock(pthread_mutex_t *mutex)
try_init_preload();
lock_release(&__get_lock(mutex)->dep_map, 0, (unsigned long)_RET_IP_);
lock_release(&__get_lock(mutex)->dep_map, (unsigned long)_RET_IP_);
/*
* Just like taking a lock, only in reverse!
*
@@ -355,7 +355,7 @@ int pthread_rwlock_rdlock(pthread_rwlock_t *rwlock)
lock_acquire(&__get_lock(rwlock)->dep_map, 0, 0, 2, 1, NULL, (unsigned long)_RET_IP_);
r = ll_pthread_rwlock_rdlock(rwlock);
if (r)
lock_release(&__get_lock(rwlock)->dep_map, 0, (unsigned long)_RET_IP_);
lock_release(&__get_lock(rwlock)->dep_map, (unsigned long)_RET_IP_);
return r;
}
@@ -369,7 +369,7 @@ int pthread_rwlock_tryrdlock(pthread_rwlock_t *rwlock)
lock_acquire(&__get_lock(rwlock)->dep_map, 0, 1, 2, 1, NULL, (unsigned long)_RET_IP_);
r = ll_pthread_rwlock_tryrdlock(rwlock);
if (r)
lock_release(&__get_lock(rwlock)->dep_map, 0, (unsigned long)_RET_IP_);
lock_release(&__get_lock(rwlock)->dep_map, (unsigned long)_RET_IP_);
return r;
}
@@ -383,7 +383,7 @@ int pthread_rwlock_trywrlock(pthread_rwlock_t *rwlock)
lock_acquire(&__get_lock(rwlock)->dep_map, 0, 1, 0, 1, NULL, (unsigned long)_RET_IP_);
r = ll_pthread_rwlock_trywrlock(rwlock);
if (r)
lock_release(&__get_lock(rwlock)->dep_map, 0, (unsigned long)_RET_IP_);
lock_release(&__get_lock(rwlock)->dep_map, (unsigned long)_RET_IP_);
return r;
}
@@ -397,7 +397,7 @@ int pthread_rwlock_wrlock(pthread_rwlock_t *rwlock)
lock_acquire(&__get_lock(rwlock)->dep_map, 0, 0, 0, 1, NULL, (unsigned long)_RET_IP_);
r = ll_pthread_rwlock_wrlock(rwlock);
if (r)
lock_release(&__get_lock(rwlock)->dep_map, 0, (unsigned long)_RET_IP_);
lock_release(&__get_lock(rwlock)->dep_map, (unsigned long)_RET_IP_);
return r;
}
@@ -408,7 +408,7 @@ int pthread_rwlock_unlock(pthread_rwlock_t *rwlock)
init_preload();
lock_release(&__get_lock(rwlock)->dep_map, 0, (unsigned long)_RET_IP_);
lock_release(&__get_lock(rwlock)->dep_map, (unsigned long)_RET_IP_);
r = ll_pthread_rwlock_unlock(rwlock);
if (r)
lock_acquire(&__get_lock(rwlock)->dep_map, 0, 0, 0, 1, NULL, (unsigned long)_RET_IP_);