On Sat, Jul 28, 2012 at 08:20:31AM +1000, Benjamin Herrenschmidt wrote:

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

quoted

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

quoted

During suspend, all interrupts including IPI will be disabled. In this case,
the suspend process will hang in SMP. To prevent this, pass the flag
IRQF_NO_SUSPEND when requesting IPI irq.

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(-)

BenH,

Can you ack?

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.

Curiosity: didn't we use to disable all non-boot CPUs on suspend ?

Cheers,
Ben.

Yes, we disabled all non-boot CPUs on suspend by calling disable_nonboot_cpus().
The disable_nonboot_cpus() needs IPIs to work. But prior to
calling disable_nonboot_cpus(), the IPIs are disabled in dpm_suspend_noirq().

-Chenhui