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authorThomas Gleixner <tglx@linutronix.de>2020-05-21 22:05:22 +0200
committerThomas Gleixner <tglx@linutronix.de>2020-06-11 15:15:06 +0200
commit98a3bf195e1a14755da3d2b83e1dbb4a3158866d (patch)
tree5d61c4a5c3d7eae95f58ce2754fee7c5b6b04272 /include
parent8a6bc4787f05d087fda8e11ead225c8830250703 (diff)
downloadlinux-98a3bf195e1a14755da3d2b83e1dbb4a3158866d.tar.bz2
genirq: Provide __irq_enter/exit_raw()
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> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Andy Lutomirski <luto@kernel.org> Link: https://lore.kernel.org/r/20200521202117.671682341@linutronix.de
Diffstat (limited to 'include')
-rw-r--r--include/linux/hardirq.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/hardirq.h b/include/linux/hardirq.h
index 3dc9102d16cf..03c9fece7d43 100644
--- a/include/linux/hardirq.h
+++ b/include/linux/hardirq.h
@@ -38,6 +38,17 @@ static __always_inline void rcu_irq_enter_check_tick(void)
} 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);
@@ -57,6 +68,15 @@ void irq_enter_rcu(void);
} 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:
*/
void irq_exit(void);