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

[Jeremy Fitzhardinge <jeremy@goop.org>]

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 <jeremy@xensource.com>

diff -r 97aa2356d521 arch/i386/mach-voyager/voyager_smp.c
--- a/arch/i386/mach-voyager/voyager_smp.c	Mon Sep 11 14:52:11 2006 -0700
+++ b/arch/i386/mach-voyager/voyager_smp.c	Mon Sep 11 16:34:09 2006 -0700
@@ -28,6 +28,7 @@
 #include <asm/pgalloc.h>
 #include <asm/tlbflush.h>
 #include <asm/arch_hooks.h>
+#include <asm/pda.h>
 
 /* TLB state -- visible externally, indexed physically */
 DEFINE_PER_CPU(struct tlb_state, cpu_tlbstate) ____cacheline_aligned = { &init_mm, 0 };
@@ -1949,4 +1950,5 @@ smp_setup_processor_id(void)
 smp_setup_processor_id(void)
 {
 	current_thread_info()->cpu = hard_smp_processor_id();
-}
+	write_pda(cpu_number, hard_smp_processor_id());
+}