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author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-05-16 20:17:56 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-05-16 20:17:56 (GMT) |
commit | 1c19b68a279c58d6da4379bf8b6d679a300a1daf (patch) | |
tree | d3907c0aa9119477dfd961bb127468d58233ac4d /kernel | |
parent | 49817c33433a3cd6f320b13699e6746cc39b453b (diff) | |
parent | a1cc5bcfcfca0b99f009b117785142dbdc3b87a3 (diff) | |
download | linux-1c19b68a279c58d6da4379bf8b6d679a300a1daf.tar.xz |
Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking changes from Ingo Molnar:
"The main changes in this cycle were:
- pvqspinlock statistics fixes (Davidlohr Bueso)
- flip atomic_fetch_or() arguments (Peter Zijlstra)
- locktorture simplification (Paul E. McKenney)
- documentation updates (SeongJae Park, David Howells, Davidlohr
Bueso, Paul E McKenney, Peter Zijlstra, Will Deacon)
- various fixes"
* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
locking/atomics: Flip atomic_fetch_or() arguments
locking/pvqspinlock: Robustify init_qspinlock_stat()
locking/pvqspinlock: Avoid double resetting of stats
lcoking/locktorture: Simplify the torture_runnable computation
locking/Documentation: Clarify that ACQUIRE applies to loads, RELEASE applies to stores
locking/Documentation: State purpose of memory-barriers.txt
locking/Documentation: Add disclaimer
locking/Documentation/lockdep: Fix spelling mistakes
locking/lockdep: Deinline register_lock_class(), save 2328 bytes
locking/locktorture: Fix NULL pointer dereference for cleanup paths
locking/locktorture: Fix deboosting NULL pointer dereference
locking/Documentation: Mention smp_cond_acquire()
locking/Documentation: Insert white spaces consistently
locking/Documentation: Fix formatting inconsistencies
locking/Documentation: Add missed subsection in TOC
locking/Documentation: Fix missed s/lock/acquire renames
locking/Documentation: Clarify relationship of barrier() to control dependencies
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/locking/lockdep.c | 2 | ||||
-rw-r--r-- | kernel/locking/locktorture.c | 25 | ||||
-rw-r--r-- | kernel/locking/qspinlock_stat.h | 24 | ||||
-rw-r--r-- | kernel/time/tick-sched.c | 4 |
4 files changed, 33 insertions, 22 deletions
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 78c1c0e..874d53e 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -708,7 +708,7 @@ look_up_lock_class(struct lockdep_map *lock, unsigned int subclass) * yet. Otherwise we look it up. We cache the result in the lock object * itself, so actual lookup of the hash should be once per lock object. */ -static inline struct lock_class * +static struct lock_class * register_lock_class(struct lockdep_map *lock, unsigned int subclass, int force) { struct lockdep_subclass_key *key; diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c index 8ef1919..f8c5af5 100644 --- a/kernel/locking/locktorture.c +++ b/kernel/locking/locktorture.c @@ -75,12 +75,7 @@ struct lock_stress_stats { long n_lock_acquired; }; -#if defined(MODULE) -#define LOCKTORTURE_RUNNABLE_INIT 1 -#else -#define LOCKTORTURE_RUNNABLE_INIT 0 -#endif -int torture_runnable = LOCKTORTURE_RUNNABLE_INIT; +int torture_runnable = IS_ENABLED(MODULE); module_param(torture_runnable, int, 0444); MODULE_PARM_DESC(torture_runnable, "Start locktorture at module init"); @@ -394,12 +389,12 @@ static void torture_rtmutex_boost(struct torture_random_state *trsp) if (!rt_task(current)) { /* - * (1) Boost priority once every ~50k operations. When the + * Boost priority once every ~50k operations. When the * task tries to take the lock, the rtmutex it will account * for the new priority, and do any corresponding pi-dance. */ - if (!(torture_random(trsp) % - (cxt.nrealwriters_stress * factor))) { + if (trsp && !(torture_random(trsp) % + (cxt.nrealwriters_stress * factor))) { policy = SCHED_FIFO; param.sched_priority = MAX_RT_PRIO - 1; } else /* common case, do nothing */ @@ -748,6 +743,15 @@ static void lock_torture_cleanup(void) if (torture_cleanup_begin()) return; + /* + * Indicates early cleanup, meaning that the test has not run, + * such as when passing bogus args when loading the module. As + * such, only perform the underlying torture-specific cleanups, + * and avoid anything related to locktorture. + */ + if (!cxt.lwsa) + goto end; + if (writer_tasks) { for (i = 0; i < cxt.nrealwriters_stress; i++) torture_stop_kthread(lock_torture_writer, @@ -776,6 +780,7 @@ static void lock_torture_cleanup(void) else lock_torture_print_module_parms(cxt.cur_ops, "End of test: SUCCESS"); +end: torture_cleanup_end(); } @@ -870,6 +875,7 @@ static int __init lock_torture_init(void) VERBOSE_TOROUT_STRING("cxt.lrsa: Out of memory"); firsterr = -ENOMEM; kfree(cxt.lwsa); + cxt.lwsa = NULL; goto unwind; } @@ -878,6 +884,7 @@ static int __init lock_torture_init(void) cxt.lrsa[i].n_lock_acquired = 0; } } + lock_torture_print_module_parms(cxt.cur_ops, "Start of test"); /* Prepare torture context. */ diff --git a/kernel/locking/qspinlock_stat.h b/kernel/locking/qspinlock_stat.h index d734b75..22e0253 100644 --- a/kernel/locking/qspinlock_stat.h +++ b/kernel/locking/qspinlock_stat.h @@ -191,8 +191,6 @@ static ssize_t qstat_write(struct file *file, const char __user *user_buf, for (i = 0 ; i < qstat_num; i++) WRITE_ONCE(ptr[i], 0); - for (i = 0 ; i < qstat_num; i++) - WRITE_ONCE(ptr[i], 0); } return count; } @@ -214,10 +212,8 @@ static int __init init_qspinlock_stat(void) struct dentry *d_qstat = debugfs_create_dir("qlockstat", NULL); int i; - if (!d_qstat) { - pr_warn("Could not create 'qlockstat' debugfs directory\n"); - return 0; - } + if (!d_qstat) + goto out; /* * Create the debugfs files @@ -227,12 +223,20 @@ static int __init init_qspinlock_stat(void) * performance. */ for (i = 0; i < qstat_num; i++) - debugfs_create_file(qstat_names[i], 0400, d_qstat, - (void *)(long)i, &fops_qstat); + if (!debugfs_create_file(qstat_names[i], 0400, d_qstat, + (void *)(long)i, &fops_qstat)) + goto fail_undo; + + if (!debugfs_create_file(qstat_names[qstat_reset_cnts], 0200, d_qstat, + (void *)(long)qstat_reset_cnts, &fops_qstat)) + goto fail_undo; - debugfs_create_file(qstat_names[qstat_reset_cnts], 0200, d_qstat, - (void *)(long)qstat_reset_cnts, &fops_qstat); return 0; +fail_undo: + debugfs_remove_recursive(d_qstat); +out: + pr_warn("Could not create 'qlockstat' debugfs entries\n"); + return -ENOMEM; } fs_initcall(init_qspinlock_stat); diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 58e3310..3daa49f 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -262,7 +262,7 @@ static void tick_nohz_dep_set_all(atomic_t *dep, { int prev; - prev = atomic_fetch_or(dep, BIT(bit)); + prev = atomic_fetch_or(BIT(bit), dep); if (!prev) tick_nohz_full_kick_all(); } @@ -292,7 +292,7 @@ void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit) ts = per_cpu_ptr(&tick_cpu_sched, cpu); - prev = atomic_fetch_or(&ts->tick_dep_mask, BIT(bit)); + prev = atomic_fetch_or(BIT(bit), &ts->tick_dep_mask); if (!prev) { preempt_disable(); /* Perf needs local kick that is NMI safe */ |