linux-kernel - Re: [patch 8/8] x86: apic

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Message-ID: <20080815115147.GA32726@elte.hu>
Date:	Fri, 15 Aug 2008 13:51:48 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	"Maciej W. Rozycki" <macro@...ux-mips.org>, tglx@...utronix.de,
	hpa@...or.com, yhlu.kernel@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [patch 8/8] x86: apic - unify init_bsp_APIC

* Cyrill Gorcunov <gorcunov@...il.com> wrote:

> On Thu, Aug 14, 2008 at 11:44 PM, Maciej W. Rozycki
> <macro@...ux-mips.org> wrote:
> > On Thu, 1 Jan 1970, Cyrill Gorcunov wrote:
> >
> >> @@ -962,7 +962,8 @@ void __init init_bsp_APIC(void)
> >>        */
> >>       apic_write(APIC_LVT0, APIC_DM_EXTINT);
> >>       value = APIC_DM_NMI;
> >> -     if (!lapic_is_integrated())             /* 82489DX */
> >> +     /* discrete on 82489DX */
> >> +     if (!lapic_is_integrated())
> >>               value |= APIC_LVT_LEVEL_TRIGGER;
> >>       apic_write(APIC_LVT1, value);
> >>  }
> >
> >  Please elaborate.
> >
> >  Maciej
> >
> 
> Hi Maciej,
> 
> don't really understand what do you mean. [...]

i suspect the question might have been: 'why this change'.

If that was the question, the answer would be: to unify apic_32.c and 
apic_64.c we first use tiny little changes to bring the two files in 
sync. Presumably, each such change is a NOP or at least very safe - and 
clearly bisectable in the worst-case.

In this case, something that only makes sense on 32-bit has been added 
over to the 64-bit side. The resulting apic.c file will have to have 
legacy code as well - but hopefully not too much.

Cyrill, i've applied your series to tip/x86/apic. (i have fixed the 
timestamps) Please address Maciej's feedback as well, in subsequent 
patches.

	Ingo
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