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Subject[patch V9 09/39] genirq: Provide __irq_enter/exit_raw()
From: Thomas Gleixner <tglx@linutronix.de>

Like __irq_enter/exit() but without time accounting. To be used for "empty"
system vectors like the scheduler IPI to avoid the overhead.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
---
include/linux/hardirq.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

--- a/include/linux/hardirq.h
+++ b/include/linux/hardirq.h
@@ -50,6 +50,17 @@ static __always_inline void rcu_irq_ente
} while (0)

/*
+ * Like __irq_enter() without time accounting for fast
+ * interrupts, e.g. reschedule IPI where time accounting
+ * is more expensive than the actual interrupt.
+ */
+#define __irq_enter_raw() \
+ do { \
+ preempt_count_add(HARDIRQ_OFFSET); \
+ lockdep_hardirq_enter(); \
+ } while (0)
+
+/*
* Enter irq context (on NO_HZ, update jiffies):
*/
void irq_enter(void);
@@ -68,6 +79,15 @@ void irq_enter_rcu(void);
preempt_count_sub(HARDIRQ_OFFSET); \
} while (0)

+/*
+ * Like __irq_exit() without time accounting
+ */
+#define __irq_exit_raw() \
+ do { \
+ lockdep_hardirq_exit(); \
+ preempt_count_sub(HARDIRQ_OFFSET); \
+ } while (0)
+
/*
* Exit irq context and process softirqs if needed:
*/
\
 
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