[PATCH 4/9] remove references to cr8 register

[Glauber de Oliveira Costa]

As pointed out by Andi, linux never really uses this register
so saving and restoring is not really necessary. This patch
removes all references to it.

Signed-off-by: Glauber de Oliveira Costa <gcosta@xxxxxxxxxx>
---
 arch/x86/kernel/asm-offsets_64.c |    1 -
 arch/x86/kernel/suspend_64.c     |    2 --
 include/asm-x86/suspend_64.h     |    2 +-
 include/asm-x86/system_64.h      |   12 ------------
 4 files changed, 1 insertions(+), 16 deletions(-)

Index: linux-2.6-x86/arch/x86/kernel/asm-offsets_64.c
===================================================================
--- linux-2.6-x86.orig/arch/x86/kernel/asm-offsets_64.c
+++ linux-2.6-x86/arch/x86/kernel/asm-offsets_64.c
@@ -107,7 +107,6 @@ int main(void)
 	ENTRY(cr2);
 	ENTRY(cr3);
 	ENTRY(cr4);
-	ENTRY(cr8);
 	BLANK();
 #undef ENTRY
 	DEFINE(TSS_ist, offsetof(struct tss_struct, ist));
Index: linux-2.6-x86/arch/x86/kernel/suspend_64.c
===================================================================
--- linux-2.6-x86.orig/arch/x86/kernel/suspend_64.c
+++ linux-2.6-x86/arch/x86/kernel/suspend_64.c
@@ -53,7 +53,6 @@ void __save_processor_state(struct saved
 	ctxt->cr2 = read_cr2();
 	ctxt->cr3 = read_cr3();
 	ctxt->cr4 = read_cr4();
-	ctxt->cr8 = read_cr8();
 }
 
 void save_processor_state(void)
@@ -75,7 +74,6 @@ void __restore_processor_state(struct sa
 	 * control registers
 	 */
 	wrmsrl(MSR_EFER, ctxt->efer);
-	write_cr8(ctxt->cr8);
 	write_cr4(ctxt->cr4);
 	write_cr3(ctxt->cr3);
 	write_cr2(ctxt->cr2);
Index: linux-2.6-x86/include/asm-x86/suspend_64.h
===================================================================
--- linux-2.6-x86.orig/include/asm-x86/suspend_64.h
+++ linux-2.6-x86/include/asm-x86/suspend_64.h
@@ -20,7 +20,7 @@ struct saved_context {
 	struct pt_regs regs;
   	u16 ds, es, fs, gs, ss;
 	unsigned long gs_base, gs_kernel_base, fs_base;
-	unsigned long cr0, cr2, cr3, cr4, cr8;
+	unsigned long cr0, cr2, cr3, cr4;
 	unsigned long efer;
 	u16 gdt_pad;
 	u16 gdt_limit;
Index: linux-2.6-x86/include/asm-x86/system_64.h
===================================================================
--- linux-2.6-x86.orig/include/asm-x86/system_64.h
+++ linux-2.6-x86/include/asm-x86/system_64.h
@@ -95,18 +95,6 @@ static inline void write_cr4(unsigned lo
 	asm volatile("movq %0,%%cr4" :: "r" (val) : "memory");
 }
 
-static inline unsigned long read_cr8(void)
-{
-	unsigned long cr8;
-	asm volatile("movq %%cr8,%0" : "=r" (cr8));
-	return cr8;
-}
-
-static inline void write_cr8(unsigned long val)
-{
-	asm volatile("movq %0,%%cr8" :: "r" (val) : "memory");
-}
-
 #define stts() write_cr0(8 | read_cr0())
 
 #define wbinvd() \
--
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