[PATCH] i386: Use per-cpu variables for GDT, PDA

Allocating PDA and GDT at boot is a pain.  Using simple per-cpu variables adds
happiness (although we need the GDT page-aligned for Xen, which we do in a
followup patch).

[akpm@linux-foundation.org: build fix]
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>

4 files changed, 6 insertions, 5 deletions

diff --git a/include/asm-generic/percpu.h b/include/asm-generic/percpu.h
index 196376262240..d984a9041436 100644
--- a/include/asm-generic/percpu.h
+++ b/include/asm-generic/percpu.h
@@ -1,6 +1,7 @@
 #ifndef _ASM_GENERIC_PERCPU_H_
 #define _ASM_GENERIC_PERCPU_H_
 #include <linux/compiler.h>
+#include <linux/threads.h>
 
 #define __GENERIC_PER_CPU
 #ifdef CONFIG_SMP
diff --git a/include/asm-i386/desc.h b/include/asm-i386/desc.h
index 050831f34f71..53c5916687b6 100644
--- a/include/asm-i386/desc.h
+++ b/include/asm-i386/desc.h
@@ -22,6 +22,7 @@ struct Xgt_desc_struct {
 
 extern struct Xgt_desc_struct idt_descr;
 DECLARE_PER_CPU(struct Xgt_desc_struct, cpu_gdt_descr);
+DECLARE_PER_CPU(struct desc_struct, cpu_gdt[GDT_ENTRIES]);
 extern struct Xgt_desc_struct early_gdt_descr;
 
 static inline struct desc_struct *get_cpu_gdt_table(unsigned int cpu)
diff --git a/include/asm-i386/pda.h b/include/asm-i386/pda.h
index b12d59a318b7..aef7f732f77e 100644
--- a/include/asm-i386/pda.h
+++ b/include/asm-i386/pda.h
@@ -8,6 +8,7 @@
 
 #include <linux/stddef.h>
 #include <linux/types.h>
+#include <asm/percpu.h>
 
 struct i386_pda
 {
@@ -18,10 +19,8 @@ struct i386_pda
         struct pt_regs *irq_regs;
 };
 
-extern struct i386_pda *_cpu_pda[];
-
-#define cpu_pda(i)      (_cpu_pda[i])
-
+DECLARE_PER_CPU(struct i386_pda, _cpu_pda);
+#define cpu_pda(i)      (&per_cpu(_cpu_pda, (i)))
 #define pda_offset(field) offsetof(struct i386_pda, field)
 
 extern void __bad_pda_field(void);
diff --git a/include/asm-i386/processor.h b/include/asm-i386/processor.h
index 01ae0ffcf236..cd940befef53 100644
--- a/include/asm-i386/processor.h
+++ b/include/asm-i386/processor.h
@@ -743,7 +743,7 @@ extern unsigned long boot_option_idle_override;
 extern void enable_sep_cpu(void);
 extern int sysenter_setup(void);
 
-extern int init_gdt(int cpu, struct task_struct *idle);
+extern void init_gdt(int cpu, struct task_struct *idle);
 extern void cpu_set_gdt(int);
 extern void secondary_cpu_init(void);