x86: make restore_fpu() use alternative assembler instructions

It's really just a single instruction, conditional on whether the CPU
supports FXSR or not, so implement it as such instead of making it a
function that queries FXSR dynamically.

This means that the instruction just gets automatically rewritten to the
correct one at boot-time.

arch/i386/kernel/i387.c

@@ -82,17 +82,6 @@ void kernel_fpu_begin(void)
 }
 EXPORT_SYMBOL_GPL(kernel_fpu_begin);
 
-void restore_fpu( struct task_struct *tsk )
-{
-	if ( cpu_has_fxsr ) {
-		asm volatile( "fxrstor %0"
-			      : : "m" (tsk->thread.i387.fxsave) );
-	} else {
-		asm volatile( "frstor %0"
-			      : : "m" (tsk->thread.i387.fsave) );
-	}
-}
-
 /*
  * FPU tag word conversions.
  */

include/asm-i386/i387.h

@@ -19,10 +19,21 @@
 
 extern void mxcsr_feature_mask_init(void);
 extern void init_fpu(struct task_struct *);
+
 /*
  * FPU lazy state save handling...
  */
-extern void restore_fpu( struct task_struct *tsk );
+
+/*
+ * The "nop" is needed to make the instructions the same
+ * length.
+ */
+#define restore_fpu(tsk)			\
+	alternative_input(			\
+		"nop ; frstor %1",		\
+		"fxrstor %1",			\
+		X86_FEATURE_FXSR,		\
+		"m" ((tsk)->thread.i387.fsave))
 
 extern void kernel_fpu_begin(void);
 #define kernel_fpu_end() do { stts(); preempt_enable(); } while(0)