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genirq: Provide __irq_enter/exit_raw()

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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
This commit is contained in:
Thomas Gleixner 2020-05-21 22:05:22 +02:00
parent 8a6bc4787f
commit 98a3bf195e
1 changed files with 20 additions and 0 deletions
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20
include/linux/hardirq.h
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@ -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:
*/