Date: Mon, 29 Mar 2004 08:17:56 -0600
From: Dan Hopper <ku4nf@austin.rr.com>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.6.5-rc2-mm4
Message-ID: <20040329141756.GA6367@yoda.dummynet>
Mail-Followup-To: Dan Hopper <ku4nf@austin.rr.com>,
	Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
References: <1E741-Sh-5@gated-at.bofh.it> <20040328235928.GA32243@obiwan.dummynet> <20040328164613.18316ab8.akpm@osdl.org>
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Andrew Morton <akpm@osdl.org> remarked:
> Dan Hopper <ku4nf@austin.rr.com> wrote:
> >
> > On a Thinkpad T40p, 2.6.5-rc2-mm4 does not boot successfully,
> >  whereas 2.6.5-rc2 does.  All the typical things (ACPI, CPUFREQ, APIC
> >  & IOAPIC, etc.) are built in.  The -mm4 kernel config was derived
> >  from the working config for 2.6.5-rc2.  
> > 
> >  I have to pass the nolapic kernel option to disable the local APIC
> >  in order to successfully boot 2.6.x kernels.  It appears that with
> >  2.6.5-rc2-mm4, this option is ignored, or perhaps there's a ordering
> >  issue with when it is checked.  With -mm4, a message saying that it
> >  is enabling the local APIC appears _before_ the "Kernel command
> >  line: ... nolapic" line appears.
> > 
> >  Without the -mm4 patch, the nolapic command line option is parsed
> >  before it would have tried to reenable the local APIC.  With -mm4,
> >  it is parsed after it tries to renable it.  Boom, and then it locks
> >  on "Calibrating delay loop...".
> > 
> >  Any relevant config options I should try with/without to help narrow
> >  it down?
> 
> Does this fix it?

Yep, it sure does.  Thanks!

Dan


> 
> ---
> 
>  25-akpm/arch/i386/kernel/apic.c |    2 +-
>  1 files changed, 1 insertion(+), 1 deletion(-)
> 
> diff -puN arch/i386/kernel/apic.c~early-param-i386-nolapic-fix arch/i386/kernel/apic.c
> --- 25/arch/i386/kernel/apic.c~early-param-i386-nolapic-fix	2004-03-28 16:41:06.685335888 -0800
> +++ 25-akpm/arch/i386/kernel/apic.c	2004-03-28 16:42:17.299600888 -0800
> @@ -616,7 +616,7 @@ static int __init lapic_disable(char *st
>  	clear_bit(X86_FEATURE_APIC, boot_cpu_data.x86_capability);
>  	return 0;
>  }
> -__setup("nolapic", lapic_disable);
> +__early_param("nolapic", lapic_disable);
>  
>  static int __init lapic_enable(char *str)
>  {
> 
> _
> 
-
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