Hi,
On Saturday, 1 of October 2005 03:25, Siddha, Suresh B wrote:
> On Fri, Sep 30, 2005 at 08:51:08AM +0200, Rafael J. Wysocki wrote:
> > On Friday, 30 of September 2005 07:26, Rafael J. Wysocki wrote:
> > > Of course. The .config is attached. Generally, it's a non-SMP box, and commenting
> > > out the zap_low_mappings((0) in setup_arch() makes the box boot again.
> >
> > One more datapoint: The box boots if I move the zap_low_mappings((0)
> > in the following way:
> >
> > --- linux-2.6.14-rc2-git7.orig/arch/x86_64/kernel/setup.c 2005-09-30 07:39:35.000000000 +0200
> > +++ linux-2.6.14-rc2-git7/arch/x86_64/kernel/setup.c 2005-09-30 08:31:20.000000000 +0200
> > @@ -571,8 +571,6 @@
> >
> > init_memory_mapping(0, (end_pfn_map << PAGE_SHIFT));
> >
> > - zap_low_mappings(0);
> > -
> > #ifdef CONFIG_ACPI
> > /*
> > * Initialize the ACPI boot-time table parser (gets the RSDP and SDT).
> > @@ -680,6 +678,8 @@
> > get_smp_config();
> > init_apic_mappings();
> > #endif
> > + zap_low_mappings(0);
> > +
>
> Rafael, I still can't reproduce the issue. All of my EM64T systems are SMP
> and looks like this problem happens only on an UP system. Looks like
> there is some code flow which is still assuming the presence of low mappings.
I think so too.
> Andi, can you please see if you can reproduce this on one of your systems
> similar to Rafael's.
>
> > /*
> > * Request address space for all standard RAM and ROM resources
> >
> > iHowever, if I place the zap_low_mappings((0) before the
> > #define CONFIG_X86_LOCAL_APIC in line 673, it doesn't boot.
> >
> > Certainly init_apic_mappings() is at fault. Could that be a reult of a call to
> > alloc_bootmem_pages()?.
>
> I looked at init_apic_mappings() and didn't give me any clue.
> alloc_bootmem_pages() don't use low direct mappings.
OK, I'll try to narrow this a bit more.
> > And one more: I have to boot with "noapic".
>
> Are you saying "noapic" is the second data point or you need to use "noapic"
> along with moving zap_low_mappings(0)
It could be the second data point. I always boot with "noapic", since otherwise
the sharing of IRQs is not handled properly on my box.
Greetings
Rafael
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