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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-08-11 09:30:24 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-08-11 09:30:24 +0200 |
| commit | b7d39aff91454f2534db2275f55908656ec0470c (patch) | |
| tree | 24481f2fe7206ef69800a33df6ac3e1716085326 /include/linux/lockdep.h | |
| parent | 7531e2f34d1d551b096143f19111139f0dd84c8b (diff) | |
| download | lwn-b7d39aff91454f2534db2275f55908656ec0470c.tar.gz lwn-b7d39aff91454f2534db2275f55908656ec0470c.zip | |
lockdep: spin_lock_nest_lock()
Expose the new lock protection lock.
This can be used to annotate places where we take multiple locks of the
same class and avoid deadlocks by always taking another (top-level) lock
first.
NOTE: we're still bound to the MAX_LOCK_DEPTH (48) limit.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/lockdep.h')
| -rw-r--r-- | include/linux/lockdep.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index 93a8cc02a033..4452c04a7f6e 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -410,8 +410,10 @@ static inline void print_irqtrace_events(struct task_struct *curr) #ifdef CONFIG_DEBUG_LOCK_ALLOC # ifdef CONFIG_PROVE_LOCKING # define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i) +# define spin_acquire_nest(l, s, t, n, i) lock_acquire(l, s, t, 0, 2, n, i) # else # define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i) +# define spin_acquire_nest(l, s, t, n, i) lock_acquire(l, s, t, 0, 1, NULL, i) # endif # define spin_release(l, n, i) lock_release(l, n, i) #else |