diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2009-03-20 11:13:20 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-30 23:19:24 +0200 |
| commit | 2f8501815256af8498904e68bd0984b1afffd6f8 (patch) | |
| tree | ffc9b4d8d80906fc2743b34dcdc93fdd2294f2c6 | |
| parent | 19cefdffbfe0f7e280f21e80875937e8700e99e2 (diff) | |
lockdep: fix deadlock in lockdep_trace_alloc
Heiko reported that we grab the graph lock with irqs enabled.
Fix this by providng the same wrapper as all other lockdep entry
functions have.
Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Nick Piggin <npiggin@suse.de>
LKML-Reference: <1237544000.24626.52.camel@twins>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | kernel/lockdep.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/kernel/lockdep.c b/kernel/lockdep.c index 022d2ed7fd8..3673a3f44d9 100644 --- a/kernel/lockdep.c +++ b/kernel/lockdep.c @@ -2260,7 +2260,7 @@ void trace_softirqs_off(unsigned long ip) debug_atomic_inc(&redundant_softirqs_off); } -void lockdep_trace_alloc(gfp_t gfp_mask) +static void __lockdep_trace_alloc(gfp_t gfp_mask, unsigned long flags) { struct task_struct *curr = current; @@ -2279,12 +2279,29 @@ void lockdep_trace_alloc(gfp_t gfp_mask) if (!(gfp_mask & __GFP_FS)) return; - if (DEBUG_LOCKS_WARN_ON(irqs_disabled())) + if (DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags))) return; mark_held_locks(curr, RECLAIM_FS); } +static void check_flags(unsigned long flags); + +void lockdep_trace_alloc(gfp_t gfp_mask) +{ + unsigned long flags; + + if (unlikely(current->lockdep_recursion)) + return; + + raw_local_irq_save(flags); + check_flags(flags); + current->lockdep_recursion = 1; + __lockdep_trace_alloc(gfp_mask, flags); + current->lockdep_recursion = 0; + raw_local_irq_restore(flags); +} + static int mark_irqflags(struct task_struct *curr, struct held_lock *hlock) { /* |