From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 20 Feb 2013 21:00:48 +0000 (+0100)
Subject: irq: Ensure irq_exit() code runs with interrupts disabled
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=74eed0163d0def3fce27228d9ccf3d36e207b286;p=deliverable%2Flinux.git

irq: Ensure irq_exit() code runs with interrupts disabled

We had already a few problems with code called from irq_exit() when
interrupted from a nesting interrupt. This can happen on architectures
which do not define __ARCH_IRQ_EXIT_IRQS_DISABLED.

__ARCH_IRQ_EXIT_IRQS_DISABLED should go away and we want to make it
mandatory to call irq_exit() with interrupts disabled.

As a temporary protection disable interrupts for those architectures
which do not define __ARCH_IRQ_EXIT_IRQS_DISABLED and add a WARN_ONCE
when an architecture which defines __ARCH_IRQ_EXIT_IRQS_DISABLED calls
irq_exit() with interrupts enabled.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linuxfoundation.org>
Link: http://lkml.kernel.org/r/alpine.LFD.2.02.1302202155320.22263@ionos
---

diff --git a/kernel/softirq.c b/kernel/softirq.c
index f5cc25f147a6..f2a934673008 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -341,6 +341,14 @@ static inline void invoke_softirq(void)
  */
 void irq_exit(void)
 {
+#ifndef __ARCH_IRQ_EXIT_IRQS_DISABLED
+	unsigned long flags;
+
+	local_irq_save(flags);
+#else
+	WARN_ON_ONCE(!irqs_disabled());
+#endif
+
 	account_irq_exit_time(current);
 	trace_hardirq_exit();
 	sub_preempt_count(IRQ_EXIT_OFFSET);
@@ -354,6 +362,9 @@ void irq_exit(void)
 #endif
 	rcu_irq_exit();
 	sched_preempt_enable_no_resched();
+#ifndef __ARCH_IRQ_EXIT_IRQS_DISABLED
+	local_irq_restore(flags);
+#endif
 }
 
 /*