• Ingo Molnar's avatar
    locking/lockdep: Detect chain_key collisions · 9e4e7554
    Ingo Molnar authored
    Add detection for chain_key collision under CONFIG_DEBUG_LOCKDEP.
    When a collision is detected the problem is reported and all lock
    debugging is turned off.
    
    Tested using liblockdep and the added tests before and after
    applying the fix, confirming both that the code added for the
    detection correctly reports the problem and that the fix actually
    fixes it.
    
    Tested tweaking lockdep to generate false collisions and
    verified that the problem is reported and that lock debugging is
    turned off.
    
    Also tested with lockdep's test suite after applying the patch:
    
        [    0.000000] Good, all 253 testcases passed! |
    Signed-off-by: default avatarAlfredo Alvarez Fernandez <alfredoalvarezernandez@gmail.com>
    Cc: Alfredo Alvarez Fernandez <alfredoalvarezfernandez@gmail.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: sasha.levin@oracle.com
    Link: http://lkml.kernel.org/r/1455864533-7536-4-git-send-email-alfredoalvarezernandez@gmail.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    9e4e7554
lockdep.c 104 KB