linux-kernel - Re: [PATCH] apm: orphan the driver

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Date:	Mon, 28 Mar 2011 23:19:16 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andi Kleen <andi@...stfloor.org>, "H. Peter Anvin" <hpa@...or.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
	Len Brown <lenb@...nel.org>,
	linux-pm@...ts.linux-foundation.org,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ondrej Zary <linux@...nbow-software.org>
Subject: Re: [PATCH] apm: orphan the driver

On Mon, 28 Mar 2011, Linus Torvalds wrote:

> > Phasing out APM idle at least would be reasonable.  resumably even if the old
> > laptops still work they are likely on AC because their batteries have
> > long died. So using a bit more power in idle shouldn't be a big
> > issue.
> 
> Agreed. Especially since I'm not at all convinced that APM CPU idling
> ever really worked in the first place.
> 
> And as you say, it's not a catastrophic failure even if we were to
> remove it, and even if it were to have mattered on those old laptops
> years ago. I think we can happily say "not worth worrying about" when
> it comes to APM_CPU_IDLE.
> 
> And shutdown, suspend and screensaver should all be much easier to
> continue to support - they shouldn't have any serious infrastructure
> issues.

APM_CPU_IDLE removal doesn't really sound as a disaster, yes. I doubt 
anyone would even notice.

So deprecating it altogether with planned Len's code reshuffling seems 
like reasonable aproach to me.

_SUSPEND, poweroff and probably _STANDBY are the parts I would care much 
more about.

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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