diff options
| 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/spinlock.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/spinlock.h')
| -rw-r--r-- | include/linux/spinlock.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h index 61e5610ad165..e0c0fccced46 100644 --- a/include/linux/spinlock.h +++ b/include/linux/spinlock.h @@ -183,8 +183,14 @@ do { \ #ifdef CONFIG_DEBUG_LOCK_ALLOC # define spin_lock_nested(lock, subclass) _spin_lock_nested(lock, subclass) +# define spin_lock_nest_lock(lock, nest_lock) \ + do { \ + typecheck(struct lockdep_map *, &(nest_lock)->dep_map);\ + _spin_lock_nest_lock(lock, &(nest_lock)->dep_map); \ + } while (0) #else # define spin_lock_nested(lock, subclass) _spin_lock(lock) +# define spin_lock_nest_lock(lock, nest_lock) _spin_lock(lock) #endif #define write_lock(lock) _write_lock(lock) |