| Date | Thu, 21 May 2020 22:05:22 +0200 | From | Thomas Gleixner <> | Subject | [patch V9 09/39] genirq: Provide __irq_enter/exit_raw() |
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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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