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lockdep: fix deadlock in lockdep_trace_alloc

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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>
This commit is contained in:
Peter Zijlstra 2009-03-20 11:13:20 +01:00 committed by Ingo Molnar
parent 19cefdffbf
commit 2f85018152
1 changed files with 19 additions and 2 deletions
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21
kernel/lockdep.c
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@ -2260,7 +2260,7 @@ void trace_softirqs_off(unsigned long ip)
debug_atomic_inc(&redundant_softirqs_off); 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; struct task_struct *curr = current;
@ -2279,12 +2279,29 @@ void lockdep_trace_alloc(gfp_t gfp_mask)
if (!(gfp_mask & __GFP_FS)) if (!(gfp_mask & __GFP_FS))
return; return;
if (DEBUG_LOCKS_WARN_ON(irqs_disabled())) if (DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags)))
return; return;
mark_held_locks(curr, RECLAIM_FS); 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) static int mark_irqflags(struct task_struct *curr, struct held_lock *hlock)
{ {
/* /*