linux-kernel - Re: [RFC][PATCH] x86: Cleanup Kconfig

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Date:	Wed, 3 Jun 2015 18:19:22 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Dave Jones <davej@...emonkey.org.uk>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] x86: Cleanup Kconfig


* Dave Jones <davej@...emonkey.org.uk> wrote:

> On Wed, Jun 03, 2015 at 09:41:32AM +0200, Ingo Molnar wrote:
>  > 
>  > * Ingo Molnar <mingo@...nel.org> wrote:
>  > 
>  > > 	select GENERIC_CLOCKEVENTS_BROADCAST	if X86_64 || (X86_32 && X86_LOCAL_APIC)
>  > 
>  > Btw., could we (in a separate patch) turn this into:
>  > 
>  > > 	select GENERIC_CLOCKEVENTS_BROADCAST
>  > 
>  > x86 systems without an APIC are rare and rarely tested, we are better off 
>  > simplifying our clockevents layout.
> 
> There's a ton of code in arch/x86 for cpus that don't have apic. Anything Cyrix 
> pre-VIA buy out, Anything AMD pre Athlon, did Intel have apic on 486 ?  
> Transmeta ?
> 
> I'm all for abandoning support for 2 decade old junk, but given how long it took 
> to drop 386, I wouldn't be surprised if there are still a lot of 586 era people 
> still out there playing doom and wearing clothes that are about to come back 
> into fashion.

We are not desupporting them in any way - we just simplify a generic clockevents 
bit by always enabling it.

Thanks,

	Ingo
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