linux/arch
Peter Zijlstra e360adbe29 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>
2010-10-18 19:58:50 +02:00
..
alpha irq_work: Add generic hardirq context callbacks 2010-10-18 19:58:50 +02:00
arm irq_work: Add generic hardirq context callbacks 2010-10-18 19:58:50 +02:00
avr32 modules: Fix module_bug_list list corruption race 2010-10-05 11:29:27 -07:00
blackfin Blackfin: bf52x/bf54x boards: drop unused nand page size 2010-08-27 16:08:43 -04:00
cris Make do_execve() take a const filename pointer 2010-08-17 18:07:43 -07:00
frv irq_work: Add generic hardirq context callbacks 2010-10-18 19:58:50 +02:00
h8300 modules: Fix module_bug_list list corruption race 2010-10-05 11:29:27 -07:00
ia64 Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6 2010-09-16 12:58:44 -07:00
m32r m32r: fix breakage from "m32r: use generic ptrace_resume code" 2010-09-24 13:54:19 -07:00
m68k arch/m68k/mac/macboing.c: use unsigned long for irqflags 2010-10-01 10:50:58 -07:00
m68knommu m68k,m68knommu: Wire up fanotify_init, fanotify_mark, and prlimit64 2010-09-13 20:28:45 +02:00
microblaze Merge branch 'merge-devicetree' of git://git.secretlab.ca/git/linux-2.6 2010-08-18 09:26:17 -07:00
mips MIPS: Octeon: Place cnmips_cu2_setup in __init memory. 2010-10-04 18:34:00 +01:00
mn10300 modules: Fix module_bug_list list corruption race 2010-10-05 11:29:27 -07:00
parisc irq_work: Add generic hardirq context callbacks 2010-10-18 19:58:50 +02:00
powerpc irq_work: Add generic hardirq context callbacks 2010-10-18 19:58:50 +02:00
s390 irq_work: Add generic hardirq context callbacks 2010-10-18 19:58:50 +02:00
score Make do_execve() take a const filename pointer 2010-08-17 18:07:43 -07:00
sh irq_work: Add generic hardirq context callbacks 2010-10-18 19:58:50 +02:00
sparc irq_work: Add generic hardirq context callbacks 2010-10-18 19:58:50 +02:00
tile Merge branch 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2010-09-24 19:08:39 -07:00
um Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2010-10-04 11:11:01 -07:00
x86 irq_work: Add generic hardirq context callbacks 2010-10-18 19:58:50 +02:00
xtensa Make do_execve() take a const filename pointer 2010-08-17 18:07:43 -07:00
.gitignore
Kconfig Merge branch 'tip/perf/core' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into perf/core 2010-09-24 09:12:05 +02:00