[PATCH 2/2 v2] arm: Allow forced irq threading
Sebastian Andrzej Siewior
arm-kernel at ml.breakpoint.cc
Mon Aug 12 16:03:01 EDT 2013
From: Thomas Gleixner <tglx at linutronix.de>
All timer interrupts and the perf interrupt are marked NO_THREAD, so
its safe to allow forced interrupt threading.
Signed-off-by: Thomas Gleixner <tglx at linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy at linutronix.de>
On Thu, Feb 14, 2013 at 11:04:48PM +0100, Thomas Gleixner wrote:
> On Thu, 14 Feb 2013, Russell King - ARM Linux wrote:
> > What effect does this have on IRQ latency, particularly on the slower CPUs?
> It does not affect anything unless you add "threadirqs" to the kernel
> command line. This command line argument puts the kernel into forced
> irq threading mode. Otherwise it just works as now.
I reposted the patch since it no longer applies clean on v3.11-rc5. From what
tglx explained, I don't think there are any outstanding issues, are there?
arch/arm/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 43594d5..405e4c0 100644
@@ -20,6 +20,7 @@ config ARM
+ select IRQ_FORCED_THREADING
select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
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