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| author |   Tejun Heo <tj@kernel.org> | 2009-01-13 20:41:35 +0900 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2009-01-16 14:19:58 +0100 |
| commit | 9939ddaff52787b2a7c1adf1b2afc95421aa0884 (patch) | |
| tree | 6e7266d065914e19c3c3f4b4e475f09b9669fa51 /arch/x86/mach-voyager | |
| parent | x86: fold pda into percpu area on SMP (diff) | |
| download | linux-dev-9939ddaff52787b2a7c1adf1b2afc95421aa0884.tar.xz linux-dev-9939ddaff52787b2a7c1adf1b2afc95421aa0884.zip | |
x86: merge 64 and 32 SMP percpu handling
Now that pda is allocated as part of percpu, percpu doesn't need to be
accessed through pda. Unify x86_64 SMP percpu access with x86_32 SMP
one. Other than the segment register, operand size and the base of
percpu symbols, they behave identical now.
This patch replaces now unnecessary pda->data_offset with a dummy
field which is necessary to keep stack_canary at its place. This
patch also moves per_cpu_offset initialization out of init_gdt() into
setup_per_cpu_areas(). Note that this change also necessitates
explicit per_cpu_offset initializations in voyager_smp.c.
With this change, x86_OP_percpu()'s are as efficient on x86_64 as on
x86_32 and also x86_64 can use assembly PER_CPU macros.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mach-voyager')
| -rw-r--r-- | arch/x86/mach-voyager/voyager_smp.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/mach-voyager/voyager_smp.c b/arch/x86/mach-voyager/voyager_smp.c index 9840b7ec749a..1a48368acb09 100644 --- a/arch/x86/mach-voyager/voyager_smp.c +++ b/arch/x86/mach-voyager/voyager_smp.c @@ -531,6 +531,7 @@ static void __init do_boot_cpu(__u8 cpu) stack_start.sp = (void *)idle->thread.sp; init_gdt(cpu); + per_cpu(this_cpu_off, cpu) = __per_cpu_offset[cpu]; per_cpu(current_task, cpu) = idle; early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu); irq_ctx_init(cpu); @@ -1748,6 +1749,7 @@ static void __init voyager_smp_prepare_cpus(unsigned int max_cpus) static void __cpuinit voyager_smp_prepare_boot_cpu(void) { init_gdt(smp_processor_id()); + per_cpu(this_cpu_off, cpu) = __per_cpu_offset[cpu]; switch_to_new_gdt(); cpu_set(smp_processor_id(), cpu_online_map); |