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authorBoqun Feng <boqun.feng@gmail.com>2020-08-07 10:42:20 +0300
committerPeter Zijlstra <peterz@infradead.org>2020-08-26 13:42:02 +0300
commite918188611f073063415f40fae568fa4d86d9044 (patch)
tree360f04ba1aeae14a4205a2b74ce0f5090bf70378 /lib/locking-selftest.c
parent92b4e9f11a636d1723cc0866bf8b9111b1e24339 (diff)
downloadlinux-e918188611f073063415f40fae568fa4d86d9044.tar.xz
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.c11
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;