diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2015-02-05 14:06:23 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-02-18 15:08:33 +0100 |
| commit | 02cea3958664723a5d2236f0f0058de97c7e4693 (patch) | |
| tree | 0bf1e7116f925131c34dc1bc217942a6e6f00688 /include/linux | |
| parent | 4fe7ffb7e17ca6ad9173b8de35f260c9c8fc2f79 (diff) | |
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 <sd@queasysnail.net>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David Miller <davem@davemloft.net>
Cc: Eyal Perry <eyalpe@mellanox.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Quentin Lambert <lambert.quentin@gmail.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Russell King <linux@arm.linux.org.uk>
Link: http://lkml.kernel.org/r/20150205130623.GH5029@twins.programming.kicks-ass.net
[ Fixed typos and such. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/hardirq.h | 2 | ||||
| -rw-r--r-- | include/linux/interrupt.h | 1 |
2 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/hardirq.h b/include/linux/hardirq.h index cba442ec3c66..f4af03404b97 100644 --- a/include/linux/hardirq.h +++ b/include/linux/hardirq.h @@ -9,7 +9,7 @@ extern void synchronize_irq(unsigned int irq); -extern void synchronize_hardirq(unsigned int irq); +extern bool synchronize_hardirq(unsigned int irq); #if defined(CONFIG_TINY_RCU) 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); |