[PATCH] i386: cleanup GDT Access
Now we have an explicit per-cpu GDT variable, we don't need to keep the
descriptors around to use them to find the GDT: expose cpu_gdt directly.
We could go further and make load_gdt() pack the descriptor for us, or even
assume it means "load the current cpu's GDT" which is what it always does.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c
index 954245f..b0ad04d 100644
--- a/arch/i386/kernel/smpboot.c
+++ b/arch/i386/kernel/smpboot.c
@@ -786,13 +786,9 @@
secondary which will soon come up. */
static __cpuinit void init_gdt(int cpu, struct task_struct *idle)
{
- struct Xgt_desc_struct *cpu_gdt_descr = &per_cpu(cpu_gdt_descr, cpu);
- struct desc_struct *gdt = per_cpu(cpu_gdt, cpu);
+ struct desc_struct *gdt = get_cpu_gdt_table(cpu);
struct i386_pda *pda = &per_cpu(_cpu_pda, cpu);
- cpu_gdt_descr->address = (unsigned long)gdt;
- cpu_gdt_descr->size = GDT_SIZE - 1;
-
pack_descriptor((u32 *)&gdt[GDT_ENTRY_PDA].a,
(u32 *)&gdt[GDT_ENTRY_PDA].b,
(unsigned long)pda, sizeof(*pda) - 1,
@@ -1187,7 +1183,11 @@
* it's on the real one. */
static inline void switch_to_new_gdt(void)
{
- load_gdt(&per_cpu(cpu_gdt_descr, smp_processor_id()));
+ struct Xgt_desc_struct gdt_descr;
+
+ gdt_descr.address = (long)get_cpu_gdt_table(smp_processor_id());
+ gdt_descr.size = GDT_SIZE - 1;
+ load_gdt(&gdt_descr);
asm volatile ("mov %0, %%fs" : : "r" (__KERNEL_PDA) : "memory");
}