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SubjectRe: [PATCH] i386-pda: Initialize the PDA early, before any C code runs.

* Jeremy Fitzhardinge <> wrote:

> Jeremy Fitzhardinge wrote:
> >Not sure, but I think this replicates the behaviour of the original
> >code (ie, INIT_THREAD_INFO initializes cpu to 0, so smp_processor_id
> >will return 0). Hm, Voyager will probably need a little patch to
> >update the the PDA cpu_number properly in smp_setup_processor_id().
> Something like this, perhaps:
> Subject: set the boot CPU number in the boot_pda
> Signed-off-by: Jeremy Fitzhardinge <>

> +++ b/arch/i386/mach-voyager/voyager_smp.c Mon Sep 11 16:34:09 2006

> smp_setup_processor_id(void)
> {
> current_thread_info()->cpu = hard_smp_processor_id();
> -}
> + write_pda(cpu_number, hard_smp_processor_id());
> +}

yeah. On all other x86 SMP platforms we use the logical APIC ID 0 for
the boot CPU. (the physical ID might be different, but that doesnt

NOTE: you'll also need to patch smp_voyager.c:find_smp_config(), where
it sets current_thread_info()->cpu to boot_cpu_id.

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