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>
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 8677534..2cf2502 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -131,48 +131,11 @@
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);
-#endif
- /*
- * Are softirqs going to be turned on now:
- */
- if (softirq_count() == SOFTIRQ_OFFSET)
- trace_softirqs_on((unsigned long)__builtin_return_address(0));
- /*
- * 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();
-}
-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);
+ local_irq_disable();
#endif
/*
* Are softirqs going to be turned on now:
@@ -190,10 +153,21 @@
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)
+{
+ _local_bh_enable_ip(ip);
+}
EXPORT_SYMBOL(local_bh_enable_ip);
/*
