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| author | Boqun Feng <boqun.feng@gmail.com> | 2020-08-07 15:42:20 +0800 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-08-26 12:42:02 +0200 |
| commit | e918188611f073063415f40fae568fa4d86d9044 (patch) | |
| tree | 360f04ba1aeae14a4205a2b74ce0f5090bf70378 /lib/locking-selftest.c | |
| parent | 92b4e9f11a636d1723cc0866bf8b9111b1e24339 (diff) | |
| download | linux-e918188611f073063415f40fae568fa4d86d9044.tar.gz linux-e918188611f073063415f40fae568fa4d86d9044.tar.bz2 linux-e918188611f073063415f40fae568fa4d86d9044.zip | |
locking: More accurate annotations for read_lock()
On the archs using QUEUED_RWLOCKS, read_lock() is not always a recursive
read lock, actually it's only recursive if in_interrupt() is true. So
change the annotation accordingly to catch more deadlocks.
Note we used to treat read_lock() as pure recursive read locks in
lib/locking-seftest.c, and this is useful, especially for the lockdep
development selftest, so we keep this via a variable to force switching
lock annotation for read_lock().
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200807074238.1632519-2-boqun.feng@gmail.com
Diffstat (limited to 'lib/locking-selftest.c')
| -rw-r--r-- | lib/locking-selftest.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c index 14f44f59e733..caadc4dd3368 100644 --- a/lib/locking-selftest.c +++ b/lib/locking-selftest.c @@ -28,6 +28,7 @@ * Change this to 1 if you want to see the failure printouts: */ static unsigned int debug_locks_verbose; +unsigned int force_read_lock_recursive; static DEFINE_WD_CLASS(ww_lockdep); @@ -1979,6 +1980,11 @@ void locking_selftest(void) } /* + * treats read_lock() as recursive read locks for testing purpose + */ + force_read_lock_recursive = 1; + + /* * Run the testsuite: */ printk("------------------------\n"); @@ -2073,6 +2079,11 @@ void locking_selftest(void) ww_tests(); + force_read_lock_recursive = 0; + /* + * queued_read_lock() specific test cases can be put here + */ + if (unexpected_testcase_failures) { printk("-----------------------------------------------------------------\n"); debug_locks = 0; |