linux-kernel - Re: [Patch v2] lapic need be checked if available when initialize acpi processor id

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Message-ID: <77730977.RNC3lGkZ0X@vostro.rjw.lan>
Date:	Fri, 02 May 2014 14:10:22 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Baoquan He <bhe@...hat.com>
Cc:	linux-kernel@...r.kernel.org, lenb@...nel.org,
	linux-acpi@...r.kernel.org, jiang.liu@...ux.intel.com,
	vgoyal@...hat.com
Subject: Re: [Patch v2] lapic need be checked if available when initialize acpi processor id

On Friday, May 02, 2014 04:51:46 PM Baoquan He wrote:
> On 04/30/14 at 10:13pm, Rafael J. Wysocki wrote:
> > On Wednesday, April 30, 2014 02:03:03 PM Baoquan He wrote:
> > > Hi Rafael,
> > 
> > Hi,
> > 
> > > Thanks for previous review for v1. Later on I thought acpi_lapic is
> > > more suitable for checking whether LAPIC in MADT is available, and it can
> > > hanlde both the UP system running SMP kernel with no LAPIC in MADT and kdump
> > > kernel after multiple CPUs system crashed on non-1st CPU.
> > > 
> > > I tested the 1st case by addding "disableapic nr_cpus=1" into cmdline
> > > of SMP kenrel, and it works. For 2nd case, it works too, below warning
> > > message is not printed any more. 
> > > 
> > > acpi LNXCPU:0a: BIOS reported wrong ACPI id 0 for the processor
> > > 
> > > Do you like this idea?
> > 
> > Well, I don't hate it, but you need to make the code build in all
> > configurations (including ia64).
> > 
> Hi Rafael,
> 
> Sorry about this, I didn't realize acpi_lapic is for x86 only. And ia64
> uses it too. About this bug, it should exist in ia64 too. After checking
> code, introducing acpi_lapic into ia64 is a solution, I will try to find
> a ia64 machine to test this though it's a little difficult, since people
> around didn't test ia64 recently.
> 
> Any suggestion  or comment?

The plan sounds good, thanks!


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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