• Ingo Molnar's avatar
    [PATCH] lockdep: better lock debugging · 9a11b49a
    Ingo Molnar authored
    Generic lock debugging:
    
     - generalized lock debugging framework. For example, a bug in one lock
       subsystem turns off debugging in all lock subsystems.
    
     - got rid of the caller address passing (__IP__/__IP_DECL__/etc.) from
       the mutex/rtmutex debugging code: it caused way too much prototype
       hackery, and lockdep will give the same information anyway.
    
     - ability to do silent tests
    
     - check lock freeing in vfree too.
    
     - more finegrained debugging options, to allow distributions to
       turn off more expensive debugging features.
    
    There's no separate 'held mutexes' list anymore - but there's a 'held locks'
    stack within lockdep, which unifies deadlock detection across all lock
    classes.  (this is independent of the lockdep validation stuff - lockdep first
    checks whether we are holding a lock already)
    
    Here are the current debugging options:
    
    CONFIG_DEBUG_MUTEXES=y
    CONFIG_DEBUG_LOCK_ALLOC=y
    
    which do:
    
     config DEBUG_MUTEXES
              bool "Mutex debugging, basic checks"
    
     config DEBUG_LOCK_ALLOC
             bool "Detect incorrect freeing of live mutexes"
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    Signed-off-by: default avatarArjan van de Ven <arjan@linux.intel.com>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    9a11b49a