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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2010-10-14 10:01:34 +0400
committerIngo Molnar <mingo@elte.hu>2010-10-18 21:58:50 +0400
commite360adbe29241a0194e10e20595360dd7b98a2b3 (patch)
treeef5fa5f50a895096bfb25bc11b25949603158238 /arch/s390/include
parent8e5fc1a7320baf6076391607515dceb61319b36a (diff)
downloadlinux-e360adbe29241a0194e10e20595360dd7b98a2b3.tar.xz
irq_work: Add generic hardirq context callbacks
Provide a mechanism that allows running code in IRQ context. It is most useful for NMI code that needs to interact with the rest of the system -- like wakeup a task to drain buffers. Perf currently has such a mechanism, so extract that and provide it as a generic feature, independent of perf so that others may also benefit. The IRQ context callback is generated through self-IPIs where possible, or on architectures like powerpc the decrementer (the built-in timer facility) is set to generate an interrupt immediately. Architectures that don't have anything like this get to do with a callback from the timer tick. These architectures can call irq_work_run() at the tail of any IRQ handlers that might enqueue such work (like the perf IRQ handler) to avoid undue latencies in processing the work. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Kyle McMartin <kyle@mcmartin.ca> Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> [ various fixes ] Signed-off-by: Huang Ying <ying.huang@intel.com> LKML-Reference: <1287036094.7768.291.camel@yhuang-dev> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/s390/include')
-rw-r--r--arch/s390/include/asm/perf_event.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/s390/include/asm/perf_event.h b/arch/s390/include/asm/perf_event.h
index 3840cbe77637..a75f168d2718 100644
--- a/arch/s390/include/asm/perf_event.h
+++ b/arch/s390/include/asm/perf_event.h
@@ -4,7 +4,6 @@
* Copyright 2009 Martin Schwidefsky, IBM Corporation.
*/
-static inline void set_perf_event_pending(void) {}
-static inline void clear_perf_event_pending(void) {}
+/* Empty, just to avoid compiling error */
#define PERF_EVENT_INDEX_OFFSET 0