Re: 2.6.5-rc2-mm4

From: Andrew Morton
Date: Sun Mar 28 2004 - 19:50:21 EST

Dan Hopper <ku4nf@xxxxxxxxxxxxx> 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?


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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