On Jul 27, 2012, at 5:20 PM, Benjamin Herrenschmidt wrote:

On Fri, 2012-07-27 at 16:58 -0500, Kumar Gala wrote:

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On Jul 20, 2012, at 7:47 AM, Zhao Chenhui wrote:
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quoted

During suspend, all interrupts including IPI will be disabled. In =

this case,

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the suspend process will hang in SMP. To prevent this, pass the flag
IRQF_NO_SUSPEND when requesting IPI irq.
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Signed-off-by: Zhao Chenhui <redacted>
Signed-off-by: Li Yang <redacted>
---
arch/powerpc/kernel/smp.c |    2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

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BenH,
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Can you ack?

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No I'll merge it but not until it's been in next for a bit unless you
have some strong emergency there, it's on my mental list of things to
shovel into next after rc1.

I wasn't clear, I was meaning for my 'next' tree, not 3.6.  Trying to =
get these FSL PM patches into my 'next' for 3.7.

- k

Curiosity: didn't we use to disable all non-boot CPUs on suspend ?
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Cheers,
Ben.
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- k
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quoted

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diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index fecb038..d26bbf8 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c

@@ -171,7 +171,7 @@ int smp_request_message_ipi(int virq, int msg)

	}
#endif
	err =3D request_irq(virq, smp_ipi_action[msg],
-			  IRQF_PERCPU | IRQF_NO_THREAD,
+			  IRQF_PERCPU | IRQF_NO_THREAD | =

IRQF_NO_SUSPEND,

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			  smp_ipi_name[msg], 0);
	WARN(err < 0, "unable to request_irq %d for %s (rc %d)\n",
		virq, smp_ipi_name[msg], err);
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1.6.4.1
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