genirq: Provide __irq_enter/exit_raw() (98a3bf19) · Commits · 戴 / test

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

include/linux/hardirq.h

+20 −0

Original line number	Diff line number	Diff line
		@@ -37,6 +37,17 @@ static __always_inline void rcu_irq_enter_check_tick(void)
		lockdep_hardirq_enter(); \
		} 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):
		*/
		@@ -56,6 +67,15 @@ 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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