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x86: initialize per-cpu GDT segment in per-cpu setup

Browse Source 
Impact: cleanup

Rename init_gdt() to setup_percpu_segment(), and move it to
setup_percpu.c.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Brian Gerst 2009-01-27 12:56:48 +09:00 committed by Tejun Heo
parent 89c9c4c58e
commit b2d2f4312b
7 changed files with 15 additions and 35 deletions
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1
arch/x86/include/asm/processor.h
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@ -778,7 +778,6 @@ extern struct desc_ptr early_gdt_descr;
extern void cpu_set_gdt(int);
extern void switch_to_new_gdt(void);
extern void cpu_init(void);
extern void init_gdt(int cpu);
static inline unsigned long get_debugctlmsr(void)
{

3
arch/x86/kernel/Makefile
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@ -60,8 +60,7 @@ obj-$(CONFIG_APM) += apm.o
obj-$(CONFIG_X86_SMP) += smp.o
obj-$(CONFIG_X86_SMP) += smpboot.o tsc_sync.o ipi.o
obj-$(CONFIG_SMP) += setup_percpu.o
obj-$(CONFIG_X86_32_SMP) += smpcommon.o
obj-$(CONFIG_X86_64_SMP) += tsc_sync.o smpcommon.o
obj-$(CONFIG_X86_64_SMP) += tsc_sync.o
obj-$(CONFIG_X86_TRAMPOLINE) += trampoline_$(BITS).o
obj-$(CONFIG_X86_MPPARSE) += mpparse.o
obj-$(CONFIG_X86_LOCAL_APIC) += apic.o nmi.o

14
arch/x86/kernel/setup_percpu.c
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@ -40,6 +40,19 @@ unsigned long __per_cpu_offset[NR_CPUS] __read_mostly = {
};
EXPORT_SYMBOL(__per_cpu_offset);
static inline void setup_percpu_segment(int cpu)
{
#ifdef CONFIG_X86_32
struct desc_struct gdt;
pack_descriptor(&gdt, per_cpu_offset(cpu), 0xFFFFF,
0x2 | DESCTYPE_S, 0x8);
gdt.s = 1;
write_gdt_entry(get_cpu_gdt_table(cpu),
GDT_ENTRY_PERCPU, &gdt, DESCTYPE_S);
#endif
}
/*
* Great future plan:
* Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
@ -81,6 +94,7 @@ void __init setup_per_cpu_areas(void)
per_cpu_offset(cpu) = ptr - __per_cpu_start;
per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu);
per_cpu(cpu_number, cpu) = cpu;
setup_percpu_segment(cpu);
/*
* Copy data used in early init routines from the initial arrays to the
* per cpu data areas. These arrays then become expendable and the

4
arch/x86/kernel/smpboot.c
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@ -793,7 +793,6 @@ static int __cpuinit do_boot_cpu(int apicid, int cpu)
do_rest:
per_cpu(current_task, cpu) = c_idle.idle;
#ifdef CONFIG_X86_32
init_gdt(cpu);
/* Stack for startup_32 can be just as for start_secondary onwards */
irq_ctx_init(cpu);
#else
@ -1186,9 +1185,6 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
void __init native_smp_prepare_boot_cpu(void)
{
int me = smp_processor_id();
#ifdef CONFIG_X86_32
init_gdt(me);
#endif
switch_to_new_gdt();
/* already set me in cpu_online_mask in boot_cpu_init() */
cpumask_set_cpu(me, cpu_callout_mask);

25
arch/x86/kernel/smpcommon.c
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@ -1,25 +0,0 @@
/*
* SMP stuff which is common to all sub-architectures.
*/
#include <linux/module.h>
#include <asm/smp.h>
#include <asm/sections.h>
#ifdef CONFIG_X86_32
/*
* Initialize the CPU's GDT. This is either the boot CPU doing itself
* (still using the master per-cpu area), or a CPU doing it for a
* secondary which will soon come up.
*/
__cpuinit void init_gdt(int cpu)
{
struct desc_struct gdt;
pack_descriptor(&gdt, __per_cpu_offset[cpu], 0xFFFFF,
0x2 | DESCTYPE_S, 0x8);
gdt.s = 1;
write_gdt_entry(get_cpu_gdt_table(cpu),
GDT_ENTRY_PERCPU, &gdt, DESCTYPE_S);
}
#endif

2
arch/x86/mach-voyager/voyager_smp.c
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@ -530,7 +530,6 @@ static void __init do_boot_cpu(__u8 cpu)
/* init_tasks (in sched.c) is indexed logically */
stack_start.sp = (void *)idle->thread.sp;
init_gdt(cpu);
per_cpu(current_task, cpu) = idle;
early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu);
irq_ctx_init(cpu);
@ -1747,7 +1746,6 @@ 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());
switch_to_new_gdt();
cpu_set(smp_processor_id(), cpu_online_map);

1
arch/x86/xen/smp.c
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@ -281,7 +281,6 @@ static int __cpuinit xen_cpu_up(unsigned int cpu)
per_cpu(current_task, cpu) = idle;
#ifdef CONFIG_X86_32
init_gdt(cpu);
irq_ctx_init(cpu);
#else
clear_tsk_thread_flag(idle, TIF_FORK);