diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-03-07 23:33:11 +0100 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-03-07 23:33:11 +0100 |
commit | 500e1af25209a048daa1f1f86083d4849d5c555b (patch) | |
tree | 81dd69220be55d3458f846cd0e1f2c4df116cb66 | |
parent | Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/ker... (diff) | |
parent | locking/ww_mutex: Adjust the lock number for stress test (diff) | |
download | linux-500e1af25209a048daa1f1f86083d4849d5c555b.tar.xz linux-500e1af25209a048daa1f1f86083d4849d5c555b.zip |
Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking fixes from Ingo Molnar:
- Change the new refcount_t warnings from WARN() to WARN_ONCE()
- two ww_mutex fixes
- plus a new lockdep self-consistency check for a bug that triggered in
practice
* 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
locking/ww_mutex: Adjust the lock number for stress test
locking/lockdep: Add nest_lock integrity test
locking/ww_mutex: Replace cpu_relax() with cond_resched() for tests
locking/refcounts: Change WARN() to WARN_ONCE()
-rw-r--r-- | kernel/locking/lockdep.c | 11 | ||||
-rw-r--r-- | kernel/locking/test-ww_mutex.c | 6 | ||||
-rw-r--r-- | lib/refcount.c | 14 |
3 files changed, 19 insertions, 12 deletions
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 12e38c213b70..a95e5d1f4a9c 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -3262,10 +3262,17 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass, if (depth) { hlock = curr->held_locks + depth - 1; if (hlock->class_idx == class_idx && nest_lock) { - if (hlock->references) + if (hlock->references) { + /* + * Check: unsigned int references:12, overflow. + */ + if (DEBUG_LOCKS_WARN_ON(hlock->references == (1 << 12)-1)) + return 0; + hlock->references++; - else + } else { hlock->references = 2; + } return 1; } diff --git a/kernel/locking/test-ww_mutex.c b/kernel/locking/test-ww_mutex.c index da6c9a34f62f..6b7abb334ca6 100644 --- a/kernel/locking/test-ww_mutex.c +++ b/kernel/locking/test-ww_mutex.c @@ -50,7 +50,7 @@ static void test_mutex_work(struct work_struct *work) if (mtx->flags & TEST_MTX_TRY) { while (!ww_mutex_trylock(&mtx->mutex)) - cpu_relax(); + cond_resched(); } else { ww_mutex_lock(&mtx->mutex, NULL); } @@ -88,7 +88,7 @@ static int __test_mutex(unsigned int flags) ret = -EINVAL; break; } - cpu_relax(); + cond_resched(); } while (time_before(jiffies, timeout)); } else { ret = wait_for_completion_timeout(&mtx.done, TIMEOUT); @@ -627,7 +627,7 @@ static int __init test_ww_mutex_init(void) if (ret) return ret; - ret = stress(4096, hweight32(STRESS_ALL)*ncpus, 1<<12, STRESS_ALL); + ret = stress(4095, hweight32(STRESS_ALL)*ncpus, 1<<12, STRESS_ALL); if (ret) return ret; diff --git a/lib/refcount.c b/lib/refcount.c index 1d33366189d1..aa09ad3c30b0 100644 --- a/lib/refcount.c +++ b/lib/refcount.c @@ -58,7 +58,7 @@ bool refcount_add_not_zero(unsigned int i, refcount_t *r) val = old; } - WARN(new == UINT_MAX, "refcount_t: saturated; leaking memory.\n"); + WARN_ONCE(new == UINT_MAX, "refcount_t: saturated; leaking memory.\n"); return true; } @@ -66,7 +66,7 @@ EXPORT_SYMBOL_GPL(refcount_add_not_zero); void refcount_add(unsigned int i, refcount_t *r) { - WARN(!refcount_add_not_zero(i, r), "refcount_t: addition on 0; use-after-free.\n"); + WARN_ONCE(!refcount_add_not_zero(i, r), "refcount_t: addition on 0; use-after-free.\n"); } EXPORT_SYMBOL_GPL(refcount_add); @@ -97,7 +97,7 @@ bool refcount_inc_not_zero(refcount_t *r) val = old; } - WARN(new == UINT_MAX, "refcount_t: saturated; leaking memory.\n"); + WARN_ONCE(new == UINT_MAX, "refcount_t: saturated; leaking memory.\n"); return true; } @@ -111,7 +111,7 @@ EXPORT_SYMBOL_GPL(refcount_inc_not_zero); */ void refcount_inc(refcount_t *r) { - WARN(!refcount_inc_not_zero(r), "refcount_t: increment on 0; use-after-free.\n"); + WARN_ONCE(!refcount_inc_not_zero(r), "refcount_t: increment on 0; use-after-free.\n"); } EXPORT_SYMBOL_GPL(refcount_inc); @@ -125,7 +125,7 @@ bool refcount_sub_and_test(unsigned int i, refcount_t *r) new = val - i; if (new > val) { - WARN(new > val, "refcount_t: underflow; use-after-free.\n"); + WARN_ONCE(new > val, "refcount_t: underflow; use-after-free.\n"); return false; } @@ -164,7 +164,7 @@ EXPORT_SYMBOL_GPL(refcount_dec_and_test); void refcount_dec(refcount_t *r) { - WARN(refcount_dec_and_test(r), "refcount_t: decrement hit 0; leaking memory.\n"); + WARN_ONCE(refcount_dec_and_test(r), "refcount_t: decrement hit 0; leaking memory.\n"); } EXPORT_SYMBOL_GPL(refcount_dec); @@ -204,7 +204,7 @@ bool refcount_dec_not_one(refcount_t *r) new = val - 1; if (new > val) { - WARN(new > val, "refcount_t: underflow; use-after-free.\n"); + WARN_ONCE(new > val, "refcount_t: underflow; use-after-free.\n"); return true; } |