diff options
| author | Maarten Lankhorst <maarten.lankhorst@canonical.com> | 2013-06-20 13:31:30 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-06-26 12:10:57 +0200 |
| commit | 2fe3d4b149ccebbb384062fbbe6634439f2bf120 (patch) | |
| tree | cc868c534a58bc75f8704d11d9a845a50fe85c17 /lib | |
| parent | 1de994452f44005e4b1f5c6c77eae4a26f86d484 (diff) | |
mutex: Add more tests to lib/locking-selftest.c
None of the ww_mutex codepaths should be taken in the 'normal'
mutex calls. The easiest way to verify this is by using the
normal mutex calls, and making sure o.ctx is unmodified.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: dri-devel@lists.freedesktop.org
Cc: linaro-mm-sig@lists.linaro.org
Cc: robclark@gmail.com
Cc: rostedt@goodmis.org
Cc: daniel@ffwll.ch
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20130620113130.4001.45423.stgit@patser
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/locking-selftest.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c index 996226224bcf..37faefdbb678 100644 --- a/lib/locking-selftest.c +++ b/lib/locking-selftest.c @@ -1162,6 +1162,67 @@ static void ww_test_fail_acquire(void) #endif } +static void ww_test_normal(void) +{ + int ret; + + WWAI(&t); + + /* + * None of the ww_mutex codepaths should be taken in the 'normal' + * mutex calls. The easiest way to verify this is by using the + * normal mutex calls, and making sure o.ctx is unmodified. + */ + + /* mutex_lock (and indirectly, mutex_lock_nested) */ + o.ctx = (void *)~0UL; + mutex_lock(&o.base); + mutex_unlock(&o.base); + WARN_ON(o.ctx != (void *)~0UL); + + /* mutex_lock_interruptible (and *_nested) */ + o.ctx = (void *)~0UL; + ret = mutex_lock_interruptible(&o.base); + if (!ret) + mutex_unlock(&o.base); + else + WARN_ON(1); + WARN_ON(o.ctx != (void *)~0UL); + + /* mutex_lock_killable (and *_nested) */ + o.ctx = (void *)~0UL; + ret = mutex_lock_killable(&o.base); + if (!ret) + mutex_unlock(&o.base); + else + WARN_ON(1); + WARN_ON(o.ctx != (void *)~0UL); + + /* trylock, succeeding */ + o.ctx = (void *)~0UL; + ret = mutex_trylock(&o.base); + WARN_ON(!ret); + if (ret) + mutex_unlock(&o.base); + else + WARN_ON(1); + WARN_ON(o.ctx != (void *)~0UL); + + /* trylock, failing */ + o.ctx = (void *)~0UL; + mutex_lock(&o.base); + ret = mutex_trylock(&o.base); + WARN_ON(ret); + mutex_unlock(&o.base); + WARN_ON(o.ctx != (void *)~0UL); + + /* nest_lock */ + o.ctx = (void *)~0UL; + mutex_lock_nest_lock(&o.base, &t); + mutex_unlock(&o.base); + WARN_ON(o.ctx != (void *)~0UL); +} + static void ww_test_two_contexts(void) { WWAI(&t); @@ -1415,6 +1476,7 @@ static void ww_tests(void) print_testname("ww api failures"); dotest(ww_test_fail_acquire, SUCCESS, LOCKTYPE_WW); + dotest(ww_test_normal, SUCCESS, LOCKTYPE_WW); dotest(ww_test_unneeded_slow, FAILURE, LOCKTYPE_WW); printk("\n"); |