[PATCH 3.19 040/101] powerpc: Re-enable dynticks
3.19-stable review patch. If anyone has any objections, please let me know.
--
From: Paul Clarke
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="
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: .
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
Signed-off-by: Paul A. Clarke
Reviewed-by: Paul E. McKenney
[mpe: Flesh out change log, fix ws & include guards, remove include of
processor.h]
Signed-off-by: Michael Ellerman
Signed-off-by: Greg Kroah-Hartman
---
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 */
--
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[PATCH 3.19 040/101] powerpc: Re-enable dynticks
3.19-stable review patch. If anyone has any objections, please let me know.
--
From: Paul Clarke p...@us.ibm.com
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 fweis...@gmail.com
Signed-off-by: Paul A. Clarke p...@us.ibm.com
Reviewed-by: Paul E. McKenney paul...@linux.vnet.ibm.com
[mpe: Flesh out change log, fix ws include guards, remove include of
processor.h]
Signed-off-by: Michael Ellerman m...@ellerman.id.au
Signed-off-by: Greg Kroah-Hartman gre...@linuxfoundation.org
---
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 */
--
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