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locking/lockdep: Make it easy to detect whether or not inside a selftest

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The patch that frees unused lock classes will modify the behavior of
lockdep_free_key_range() and lockdep_reset_lock() depending on whether
or not these functions are called from the context of the lockdep
selftests. Hence make it easy to detect whether or not lockdep code
is called from the context of a lockdep selftest.

Signed-off-by: Bart Van Assche <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Waiman Long <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Bart Van Assche 2019-02-14 15:00:44 -08:00 • committed by Ingo Molnar
commit cdc84d7949
3 changed files with 13 additions and 0 deletions
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2
lib/locking-selftest.c
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@ -1989,6 +1989,7 @@ void locking_selftest(void)
init_shared_classes();
debug_locks_silent = !debug_locks_verbose;
lockdep_set_selftest_task(current);
DO_TESTCASE_6R("A-A deadlock", AA);
DO_TESTCASE_6R("A-B-B-A deadlock", ABBA);
@ -2097,5 +2098,6 @@ void locking_selftest(void)
printk("---------------------------------\n");
debug_locks = 1;
}
lockdep_set_selftest_task(NULL);
debug_locks_silent = 0;
}