linux-kernel - Re: [PATCH] x86 idle APM: delete apm_cpu_idle(), and its use of pm

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Message-ID: <20110331065622.GE5938@elte.hu>
Date:	Thu, 31 Mar 2011 08:56:22 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Len Brown <lenb@...nel.org>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	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,
	linux-pm@...ts.linux-foundation.org,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ondrej Zary <linux@...nbow-software.org>
Subject: Re: [PATCH] x86 idle APM: delete apm_cpu_idle(), and its use of
 pm_idle


* Len Brown <lenb@...nel.org> wrote:

> From: Len Brown <len.brown@...el.com>
> 
> There is some doubt whether the APM idle feature
> to call into the BIOS from the idle loop is reliable.
> Certainly it was known to fail on some machines,
> but more importantly, APM machines have not shipped
> for a decade and so finding machines to test the code
> is problematic.
> 
> After this patch, systems running in APM mode will
> simply run default_idle() and HALT without calling
> into the BIOS from their idle loop.
> 
> This deletes a much-maligned modular user of the (pm_idle)()
> function pointer.
> 
> Signed-off-by: Len Brown <len.brown@...el.com>

Ok, this should have far less negative impact on old hardware.

Acked-by: Ingo Molnar <mingo@...e.hu>

Thanks,

	Ingo
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