9a11b49a80
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: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
20 lines
658 B
C
20 lines
658 B
C
/*
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* asm-generic/mutex-null.h
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*
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* Generic implementation of the mutex fastpath, based on NOP :-)
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*
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* This is used by the mutex-debugging infrastructure, but it can also
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* be used by architectures that (for whatever reason) want to use the
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* spinlock based slowpath.
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*/
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#ifndef _ASM_GENERIC_MUTEX_NULL_H
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#define _ASM_GENERIC_MUTEX_NULL_H
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#define __mutex_fastpath_lock(count, fail_fn) fail_fn(count)
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#define __mutex_fastpath_lock_retval(count, fail_fn) fail_fn(count)
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#define __mutex_fastpath_unlock(count, fail_fn) fail_fn(count)
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#define __mutex_fastpath_trylock(count, fail_fn) fail_fn(count)
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#define __mutex_slowpath_needs_to_unlock() 1
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#endif
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