From 02cea3958664723a5d2236f0f0058de97c7e4693 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Thu, 5 Feb 2015 14:06:23 +0100 Subject: genirq: Provide disable_hardirq() For things like netpoll there is a need to disable an interrupt from atomic context. Currently netpoll uses disable_irq() which will sleep-wait on threaded handlers and thus forced_irqthreads breaks things. Provide disable_hardirq(), which uses synchronize_hardirq() to only wait for active hardirq handlers; also change synchronize_hardirq() to return the status of threaded handlers. This will allow one to try-disable an interrupt from atomic context, or in case of request_threaded_irq() to only wait for the hardirq part. Suggested-by: Sabrina Dubroca Signed-off-by: Peter Zijlstra (Intel) Cc: Arnd Bergmann Cc: David Miller Cc: Eyal Perry Cc: Linus Torvalds Cc: Paul E. McKenney Cc: Quentin Lambert Cc: Randy Dunlap Cc: Russell King Link: http://lkml.kernel.org/r/20150205130623.GH5029@twins.programming.kicks-ass.net [ Fixed typos and such. ] Signed-off-by: Ingo Molnar --- include/linux/interrupt.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux/interrupt.h') diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index d9b05b5bf8c7..3bb01b9a379c 100644 --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -184,6 +184,7 @@ extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id); #endif extern void disable_irq_nosync(unsigned int irq); +extern bool disable_hardirq(unsigned int irq); extern void disable_irq(unsigned int irq); extern void disable_percpu_irq(unsigned int irq); extern void enable_irq(unsigned int irq); -- cgit v1.2.3