On Sun, Mar 02, 2008 at 04:08:20PM -0800, Arjan van de Ven wrote:
> On Mon, 3 Mar 2008 02:43:08 +0300
> Anton Vorontsov <cbouatmailru@xxxxxxxxx> wrote:
>
> > Currently drivers handle CONFIG_PM this way:
> >
> > #ifdef CONFIG_PM
> > drv_suspend() {}
> > drv_resume() {}
> > #else
> > #define drv_suspend NULL
> > #define drv_resume NULL
> > #endif
> >
> > struct driver drv = {
> > .suspend = drv_suspend,
> > .resume = drv_resume,
> > };
> >
> > With this patch, the code above converts into:
> >
> > drv_suspend() {}
> > drv_resume() {}
> >
> > struct driver drv = {
> > .suspend = pm_call(drv_suspend),
> > .resume = pm_call(drv_resume),
> > };
> >
> > GCC will optimize away suspend/resume calls if they're really
> > not used.
> >
>
>
> to be honest, at this point I would think it's time to remove
> CONFIG_PM, or rather,
> just make it always be there and just get rid of the ifdefs.
Don't be so CONFIG_PM-centric :-)
$ zcat /proc/config.gz | grep CONFIG_PM
# CONFIG_PM is not set
This is machine I use at home.
> We're saving 2 words and a bit of code,
> but only a case that not even the embedded guys use.
Well, on my ARM machine, with CONFIG_PM=y vmlinux grows by 30KB, half
of that is in drivers/. 30KB is 1% of the vmlinux. Is it enough to
worth saving? I don't know.
On a x86 box, CONFIG_PM=y grows the vmlinux by 400KB (yeah, it's
including ACPI and stuff), though here I didn't count drivers'
suspend/resume hooks contribution share.
--
Anton Vorontsov
email: cbouatmailru@xxxxxxxxx
irc://irc.freenode.net/bd2
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