mirror of
https://github.com/torvalds/linux.git
synced 2024-11-17 17:41:44 +00:00
e360adbe29
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>
10 lines
202 B
C
10 lines
202 B
C
/*
|
|
* Performance event support - s390 specific definitions.
|
|
*
|
|
* Copyright 2009 Martin Schwidefsky, IBM Corporation.
|
|
*/
|
|
|
|
/* Empty, just to avoid compiling error */
|
|
|
|
#define PERF_EVENT_INDEX_OFFSET 0
|