summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorJohannes Berg <johannes@sipsolutions.net>2008-06-18 09:29:37 +0200
committerIngo Molnar <mingo@elte.hu>2008-06-20 15:45:29 +0200
commit0f476b6d91a1395bda6464e653ce66ea9bea7167 (patch)
tree28a7f73ebc553dec0ee136395c99f641b0cbf6cc
parent4620b49f76096fa5183eecad7d689faa898a4c82 (diff)
downloadlwn-0f476b6d91a1395bda6464e653ce66ea9bea7167.tar.gz
lwn-0f476b6d91a1395bda6464e653ce66ea9bea7167.zip
softirq: remove irqs_disabled warning from local_bh_enable
There's no need to use local_irq_save() over local_irq_disable() in the local_bh_enable code since it is a bug to call it with irqs disabled and do_softirq will enable irqs if there is any pending work. Consolidate the code from local_bh_enable and ..._ip to avoid having a disconnect between them in the warnings they trigger that is currently there. Also always trigger the warning on in_irq(), not just in the trace-irqflags case. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Cc: Michael Buesch <mb@bu3sch.de> Cc: David Ellingsworth <david@identd.dyndns.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--kernel/softirq.c48
1 files changed, 11 insertions, 37 deletions
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 86775340ef1d..2cf2502b7c73 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -131,23 +131,17 @@ void _local_bh_enable(void)
EXPORT_SYMBOL(_local_bh_enable);
-void local_bh_enable(void)
+static inline void _local_bh_enable_ip(unsigned long ip)
{
+ WARN_ON_ONCE(in_irq() || irqs_disabled());
#ifdef CONFIG_TRACE_IRQFLAGS
- unsigned long flags;
-
- WARN_ON_ONCE(in_irq());
-#endif
- WARN_ON_ONCE(irqs_disabled());
-
-#ifdef CONFIG_TRACE_IRQFLAGS
- local_irq_save(flags);
+ local_irq_disable();
#endif
/*
* Are softirqs going to be turned on now:
*/
if (softirq_count() == SOFTIRQ_OFFSET)
- trace_softirqs_on((unsigned long)__builtin_return_address(0));
+ trace_softirqs_on(ip);
/*
* Keep preemption disabled until we are done with
* softirq processing:
@@ -159,40 +153,20 @@ void local_bh_enable(void)
dec_preempt_count();
#ifdef CONFIG_TRACE_IRQFLAGS
- local_irq_restore(flags);
+ local_irq_enable();
#endif
preempt_check_resched();
}
+
+void local_bh_enable(void)
+{
+ _local_bh_enable_ip((unsigned long)__builtin_return_address(0));
+}
EXPORT_SYMBOL(local_bh_enable);
void local_bh_enable_ip(unsigned long ip)
{
-#ifdef CONFIG_TRACE_IRQFLAGS
- unsigned long flags;
-
- WARN_ON_ONCE(in_irq());
-
- local_irq_save(flags);
-#endif
- /*
- * Are softirqs going to be turned on now:
- */
- if (softirq_count() == SOFTIRQ_OFFSET)
- trace_softirqs_on(ip);
- /*
- * Keep preemption disabled until we are done with
- * softirq processing:
- */
- sub_preempt_count(SOFTIRQ_OFFSET - 1);
-
- if (unlikely(!in_interrupt() && local_softirq_pending()))
- do_softirq();
-
- dec_preempt_count();
-#ifdef CONFIG_TRACE_IRQFLAGS
- local_irq_restore(flags);
-#endif
- preempt_check_resched();
+ _local_bh_enable_ip(ip);
}
EXPORT_SYMBOL(local_bh_enable_ip);