Re: [PATCH 1/6] Hibernation: Introduce new system state for the last phase of hibernation

[Rafael J. Wysocki]

On Friday, 3 of October 2008, Andrew Morton wrote:
> On Tue, 30 Sep 2008 00:10:37 +0200 "Rafael J. Wysocki" <rjw@xxxxxxx> wrote:
> 
> > Hibernation: Introduce new system state for the last phase of hibernation
> > 
> > Replace unused SYSTEM_SUSPEND_DISK with a new system_state value
> > SYSTEM_HIBERNATE_ENTER that can be used by device drivers to check if
> > the system is in the last phase of hibernation.
> 
> Violent objections.
> 
> We just don't know what this change will do.  It potentially affects
> every code site in the kernel which looks at system_state.

Do you mean anyone checking 'system_state != SOMETHING' ?  Oh well.

> We've had problems in the past with this thing and the more complex we make it,
> the worse any future problems will be.  It's Just Bad.
> 
> Can we just create a new global?
> 
> 	extern bool system_entering_hibernation_or_whatever;

Yes, we can, but what about:

extern bool system_entering_hibernation(void);

that will become a static inline in case of !CONFIG_HIBERNATION,
and using a static variable?
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