Re: [linux-pm] [RFC] Add some hooks to generic suspend code

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

> Why do you need it? Do you initiate suspend without userland asking
> you to?

Because there is an existing API, via /dev/apm_bios, and that's all X
understands ! And because I've always done that ;)

> Anyway, it should not be arch-dependend. We need one good mechanism of
> notifying userland, not one per architecture.

We need to define a new mecanism, I think. In the meantime, my APM
emulation works though and I won't drop it. 

> > > > 	/* called after unfreezing userland */
> > > > 	void (*post_freeze)(suspend_state_t state);
> > > > 
> > > > That one is the mirror of pre-freeze, gets called after userland has been re-enabled,
> > > > it also calls my old-style notifiers, which includes APM emulation, which is important
> > > > for sending the APM wakeup events to things like X.
> > > 
> > > Could this be marked deprecated, too?
> > > 
> > > Alternatively, proper way of notifying X (etc) should be created, and
> > > done from generic code....
> > 
> > Sure, ideally. However, existing X knows how to deal with APM events,
> > and thus APM emulation is an important thing to get something that
> > works. Pne thing I should do is consolidate PPC APM emu with ARM one as
> > I think Russell improve my stuff significantly.
> 
> Perhaps we need apm emulation on i386, too?

Maybe. It may help in some cases.

Ben.