[PATCH] x86: add an accessor function for getting the per-CPU gdt

Add an accessor function for getting the per-CPU gdt.  Callee must already
have the CPU.

Signed-off-by: Zachary Amsden <zach@vmware.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/include/asm-i386/desc.h b/include/asm-i386/desc.h
index 6df1a53c190..29b851a18c6 100644
--- a/include/asm-i386/desc.h
+++ b/include/asm-i386/desc.h
@@ -17,6 +17,8 @@
 extern struct desc_struct cpu_gdt_table[GDT_ENTRIES];
 DECLARE_PER_CPU(struct desc_struct, cpu_gdt_table[GDT_ENTRIES]);
 
+#define get_cpu_gdt_table(_cpu) (per_cpu(cpu_gdt_table,_cpu))
+
 DECLARE_PER_CPU(unsigned char, cpu_16bit_stack[CPU_16BIT_STACK_SIZE]);
 
 struct Xgt_desc_struct {
@@ -60,7 +62,7 @@ __asm__ __volatile__ ("movw %w3,0(%2)\n\t" \
 
 static inline void __set_tss_desc(unsigned int cpu, unsigned int entry, void *addr)
 {
-        _set_tssldt_desc(&per_cpu(cpu_gdt_table, cpu)[entry], (int)addr,
+        _set_tssldt_desc(&get_cpu_gdt_table(cpu)[entry], (int)addr,
                 offsetof(struct tss_struct, __cacheline_filler) - 1, 0x89);
 }
 
@@ -68,7 +70,7 @@ static inline void __set_tss_desc(unsigned int cpu, unsigned int entry, void *ad
 
 static inline void set_ldt_desc(unsigned int cpu, void *addr, unsigned int size)
 {
-        _set_tssldt_desc(&per_cpu(cpu_gdt_table, cpu)[GDT_ENTRY_LDT], (int)addr, ((size << 3)-1), 0x82);
+        _set_tssldt_desc(&get_cpu_gdt_table(cpu)[GDT_ENTRY_LDT], (int)addr, ((size << 3)-1), 0x82);
 }
 
 #define LDT_entry_a(info) \
@@ -109,7 +111,7 @@ static inline void write_ldt_entry(void *ldt, int entry, __u32 entry_a, __u32 en
 
 static inline void load_TLS(struct thread_struct *t, unsigned int cpu)
 {
-#define C(i) per_cpu(cpu_gdt_table, cpu)[GDT_ENTRY_TLS_MIN + i] = t->tls_array[i]
+#define C(i) get_cpu_gdt_table(cpu)[GDT_ENTRY_TLS_MIN + i] = t->tls_array[i]
         C(0); C(1); C(2);
 #undef C
 }