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| author | Arjan van de Ven <arjan@linux.intel.com> | 2006-11-25 11:09:37 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-11-25 13:28:34 -0800 |
| commit | cfd3ef2346f924d6c0e82236c20fdb3a8840136a (patch) | |
| tree | f0289367f0dbf80a5bcfa2969f428c605c54dd6a /kernel/spinlock.c | |
| parent | ee3ce191e8eaa4cc15c51a28b34143b36404c4f5 (diff) | |
| download | lwn-cfd3ef2346f924d6c0e82236c20fdb3a8840136a.tar.gz lwn-cfd3ef2346f924d6c0e82236c20fdb3a8840136a.zip | |
[PATCH] lockdep: spin_lock_irqsave_nested()
Introduce spin_lock_irqsave_nested(); implementation from:
http://lkml.org/lkml/2006/6/1/122
Patch from:
http://lkml.org/lkml/2006/9/13/258
[akpm@osdl.org: two compile fixes]
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Jiri Kosina <jikos@jikos.cz>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/spinlock.c')
| -rw-r--r-- | kernel/spinlock.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/kernel/spinlock.c b/kernel/spinlock.c index 476c3741511b..2c6c2bf85514 100644 --- a/kernel/spinlock.c +++ b/kernel/spinlock.c @@ -293,6 +293,27 @@ void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass) } EXPORT_SYMBOL(_spin_lock_nested); +unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock, int subclass) +{ + unsigned long flags; + + local_irq_save(flags); + preempt_disable(); + spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_); + /* + * On lockdep we dont want the hand-coded irq-enable of + * _raw_spin_lock_flags() code, because lockdep assumes + * that interrupts are not re-enabled during lock-acquire: + */ +#ifdef CONFIG_PROVE_SPIN_LOCKING + _raw_spin_lock(lock); +#else + _raw_spin_lock_flags(lock, &flags); +#endif + return flags; +} + +EXPORT_SYMBOL(_spin_lock_irqsave_nested); #endif |