Re: swsusp: allow resume from initramfs

[Pavel Machek <pavel@suse.cz>]

Hi!

> > > You guys are reinventing the wheel a lot at the moment and I'm in the
> > > middle of doing it for x86_64 lowlevel code :> Can we see if we can work
> > > a little more closely - perhaps we can get some shared code going that
> > > will allow us to handle these issues without stepping on each others'
> > > feet? In particular, shared code for
> > > 
> > > - initramfs and initrd support
> > 
> > Its actually done, and it was few strategically placed lines of code
> > (like 20 lines). I do not think it can be meaningfully shared.
> 
> Mmm. But if we're both putting hooks in the same places...

There are very little hooks... But we may want to make sure we have
same userland interface. swsusp uses "echo 3:5 > /sys/power/resume" to
trigger resume from device major 3 minor 5.

> > > - lowlevel suspend & resume
> > 
> > This makes very good sense to share. We have i386, x86-64 and ppc
> > versions. They simply walk list of pbe's; that should be simple enough
> > to be usable for suspend2, too....
> 
> The CPU save and restore, yes. But I use a different format for
> recording the image metadata (I use bitmaps to record the locations of
> pages). Perhaps I should hasten to mention the bitmaps are discontiguous
> - single pages connected by a kmalloc'd list. The copyback itself will
> need to stay distinct.

Hmm, bitmaps? Okay, then low-level code needs to stay separate. (And
thats bad, I wanted that one to be shared most).
								Pavel

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