Commit-ID: da40a037c5ed51693e739ff9b21e013414244644
Gitweb: http://git.kernel.org/tip/da40a037c5ed51693e739ff9b21e013414244644
Author: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
AuthorDate: Sat, 21 Mar 2009 13:33:08 +0100
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Sat, 21 Mar 2009 17:15:42 +0100
lockdep: fix deadlock in lockdep_trace_alloc, take 2
Since we now disabled IRQs, checking for IRQs disabled is a bit
pointless, check for it in the saved flags.
Also, add the missing check_flags() check for completeness.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: npiggin@xxxxxxx
Cc: heiko.carstens@xxxxxxxxxx
LKML-Reference: <1237638788.4667.263.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
kernel/lockdep.c | 9 ++++++---
1 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index c750038..a288ae1 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -2257,7 +2257,7 @@ void trace_softirqs_off(unsigned long ip)
debug_atomic_inc(&redundant_softirqs_off);
}
-static 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;
@@ -2276,12 +2276,14 @@ static 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;
@@ -2290,8 +2292,9 @@ void lockdep_trace_alloc(gfp_t gfp_mask)
return;
raw_local_irq_save(flags);
+ check_flags(flags);
current->lockdep_recursion = 1;
- __lockdep_trace_alloc(gfp_mask);
+ __lockdep_trace_alloc(gfp_mask, flags);
current->lockdep_recursion = 0;
raw_local_irq_restore(flags);
}
--
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