This is a note to let you know that I've just added the patch titled
powerpc: Re-enable dynticks
to the 3.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-re-enable-dynticks.patch
and it can be found in the queue-3.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From fea559f303567e558bfab9c8ba4a2af5b309205a Mon Sep 17 00:00:00 2001
From: Paul Clarke <[email protected]>
Date: Fri, 20 Feb 2015 11:13:33 -0600
Subject: powerpc: Re-enable dynticks
From: Paul Clarke <[email protected]>
commit fea559f303567e558bfab9c8ba4a2af5b309205a upstream.
Implement arch_irq_work_has_interrupt() for powerpc
Commit 9b01f5bf3 introduced a dependency on "IRQ work self-IPIs" for
full dynamic ticks to be enabled, by expecting architectures to
implement a suitable arch_irq_work_has_interrupt() routine.
Several arches have implemented this routine, including x86 (3010279f)
and arm (09f6edd4), but powerpc was omitted.
This patch implements this routine for powerpc.
The symptom, at boot (on powerpc systems) with "nohz_full=<CPU list>"
is displayed:
NO_HZ: Can't run full dynticks because arch doesn't support irq work
self-IPIs
after this patch:
NO_HZ: Full dynticks CPUs: <CPU list>.
Tested against 3.19.
powerpc implements "IRQ work self-IPIs" by setting the decrementer to 1 in
arch_irq_work_raise(), which causes a decrementer exception on the next
timebase tick. We then handle the work in __timer_interrupt().
CC: Frederic Weisbecker <[email protected]>
Signed-off-by: Paul A. Clarke <[email protected]>
Reviewed-by: Paul E. McKenney <[email protected]>
[mpe: Flesh out change log, fix ws & include guards, remove include of
processor.h]
Signed-off-by: Michael Ellerman <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/powerpc/include/asm/irq_work.h | 9 +++++++++
1 file changed, 9 insertions(+)
--- /dev/null
+++ b/arch/powerpc/include/asm/irq_work.h
@@ -0,0 +1,9 @@
+#ifndef _ASM_POWERPC_IRQ_WORK_H
+#define _ASM_POWERPC_IRQ_WORK_H
+
+static inline bool arch_irq_work_has_interrupt(void)
+{
+ return true;
+}
+
+#endif /* _ASM_POWERPC_IRQ_WORK_H */
Patches currently in stable-queue which might be from [email protected] are
queue-3.19/powerpc-re-enable-dynticks.patch
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