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authorDaniel Lezcano <daniel.lezcano@linaro.org>2017-07-06 14:29:04 +0200
committerThomas Gleixner <tglx@linutronix.de>2017-07-06 23:16:22 +0200
commitc80081b9209713e0fe86d3def395a9fc66503c58 (patch)
tree08420ed8f4eebb47f388207602e31d8c90a94373 /include/linux/interrupt.h
parent2343877fbda701599653e63f8dcc318aa1bf15ee (diff)
genirq: Allow to pass the IRQF_TIMER flag with percpu irq request
The irq timings infrastructure tracks when interrupts occur in order to statistically predict te next interrupt event. There is no point to track timer interrupts and try to predict them because the next expiration time is already known. This can be avoided via the IRQF_TIMER flag which is passed by timer drivers in request_irq(). It marks the interrupt as timer based which alloes to ignore these interrupts in the timings code. Per CPU interrupts which are requested via request_percpu_+irq() have no flag argument, so marking per cpu timer interrupts is not possible and they get tracked pointlessly. Add __request_percpu_irq() as a variant of request_percpu_irq() with a flags argument and make request_percpu_irq() an inline wrapper passing flags = 0. The flag parameter is restricted to IRQF_TIMER as all other IRQF_ flags make no sense for per cpu interrupts. The next step is to convert all existing users of request_percpu_irq() and then remove the wrapper and the underscores. [ tglx: Massaged changelog ] Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: peterz@infradead.org Cc: nicolas.pitre@linaro.org Cc: vincent.guittot@linaro.org Cc: rafael@kernel.org Link: http://lkml.kernel.org/r/1499344144-3964-1-git-send-email-daniel.lezcano@linaro.org
Diffstat (limited to 'include/linux/interrupt.h')
-rw-r--r--include/linux/interrupt.h11
1 files changed, 10 insertions, 1 deletions
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 37f8e354f564..5ac6e238555e 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -152,8 +152,17 @@ request_any_context_irq(unsigned int irq, irq_handler_t handler,
unsigned long flags, const char *name, void *dev_id);
extern int __must_check
+__request_percpu_irq(unsigned int irq, irq_handler_t handler,
+ unsigned long flags, const char *devname,
+ void __percpu *percpu_dev_id);
+
+static inline int __must_check
request_percpu_irq(unsigned int irq, irq_handler_t handler,
- const char *devname, void __percpu *percpu_dev_id);
+ const char *devname, void __percpu *percpu_dev_id)
+{
+ return __request_percpu_irq(irq, handler, 0,
+ devname, percpu_dev_id);
+}
extern const void *free_irq(unsigned int, void *);
extern void free_percpu_irq(unsigned int, void __percpu *);