linux-kernel - Re: RFD: Should we remove the HLT check? (was Re: [PATCH 1/8] x86: avoid check hlt if no timer interrupts)

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Message-ID: <alpine.LFD.2.00.1005071354310.901@i5.linux-foundation.org>
Date:	Fri, 7 May 2010 13:54:51 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Arjan van de Ven <arjan@...ux.intel.com>
cc:	"H. Peter Anvin" <hpa@...or.com>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Alek Du <alek.du@...el.com>,
	Feng Tang <feng.tang@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jacob Pan <jacob.jun.pan@...el.com>,
	Arjan van de Ven <arjan.van.de.ven@...el.com>
Subject: Re: RFD: Should we remove the HLT check?  (was Re: [PATCH 1/8] x86:
 avoid check hlt if no timer interrupts)



On Fri, 7 May 2010, Arjan van de Ven wrote:

> On 5/7/2010 13:32, H. Peter Anvin wrote:
> > 
> > I really wish I knew the exact systems affected by the HLT bug.  If I
> > remember correctly, it was some 386 systems -- or possibly 486 systems
> > as well -- a very long time ago.  This test just provides a diagnosis if
> > the system really is bad (it hangs with an obvious message) at the cost
> > of some 40 ms to the system boot time.  I suspect C1 (HLT) being broken
> > is not anywhere close to the predominant power management problem in the
> > current day, and as such I'm wondering if this particular test hasn't
> > outlived its usefulness.
> > 
> > Thoughts?
> 
> we could at least hide it behind the "don't run on pentium or newer" config
> options..

Ack. That would take care of all relevant machines.

		Linus
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