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authorPeter Zijlstra <peterz@infradead.org>2015-02-05 16:06:23 +0300
committerIngo Molnar <mingo@kernel.org>2015-02-18 17:08:33 +0300
commit02cea3958664723a5d2236f0f0058de97c7e4693 (patch)
tree0bf1e7116f925131c34dc1bc217942a6e6f00688 /include/linux/hardirq.h
parent4fe7ffb7e17ca6ad9173b8de35f260c9c8fc2f79 (diff)
downloadlinux-02cea3958664723a5d2236f0f0058de97c7e4693.tar.xz
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/hardirq.h')
-rw-r--r--include/linux/hardirq.h2
1 files changed, 1 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)