linux-kernel - Re: [PATCH] x86 APM: delete Linux kernel APM support

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Date:	Sat, 26 Mar 2011 00:35:51 -0400 (EDT)
From:	Len Brown <lenb@...nel.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Stephen Rothwell <sfr@...b.auug.org.au>, x86@...nel.org,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] x86 APM: delete Linux kernel APM support

> >  > > Beyond the lack of a upstream-visible feature-removal-schedule entry, we 
> >  > > still have an Arcnet driver which hardware was obsoleted by Ethernet in the 
> >  > > late 80s, and we still have i486 support and those are *much* older than 
> >  > > APM.

> > So how does your reasoning not apply to those drivers? There's several which 
> > are older than APM support.

If we follow-through with the proposed cpuidle changes,
then we'll have to cut APM code.   The problem isn't cutting
the code, it is testing it.  I do have a couple of 15-year old
laptops which include APM support.  However, with ACPI disabled
to enable APM, they don't even boot the upstream kernel today.

> > We had this really big battle about x86/Voyager two years ago, which x86 
> > subarchitecture literally had just a single user left, and the code was more 
> > intrusive than APM. Even there after much flaming the eventual consensus was 
> > that we'd accept it back if it was done cleanly, as part of the new-style 
> > x86_platform code.
> > 
> > Given that APM fits into the current PM frameworks there's no such problem here 
> > that i can see.

Somebody was pushing for Voyager support in the kernel
and was energetic about maintaining it.

cheers,
-Len

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