Re: [linux-pm] [RFC][PATCH 2/2] PM: Rework handling of interrupts during suspend-resume

Linus Torvalds
2009-02-28T17:04:20Z

On Sat, 28 Feb 2009, Rafael J. Wysocki wrote:
>
> Still, if Linus agrees, I can put the loop suggested by him directly into
> sysdev_suspend(). Linus?

I don't much care - it's going to be a no-op on architectures that don't
have that kind of "turn an interrupt into a wakeup event" capability. So
it's not going to break for things like x86, and it's not like going over
the irq list one more time is going to be so expensive as to be
noticeable, even if that architecture doesn't ever get any advantage of
it.

However - my main worry is that we will notice that different
architectures (and possibly even different platforms _within_ the same
architecture - depending on which kind of interrupt/pm controller they
have) will want to do different things, and actually do something to the
interrupt controller itself too at that point.

But we can certainly try starting out with just the generic "if a wakeup
interrupt is pending, sysdev_suspend() returns an error immediately".

Linus