X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=include%2Fasm-i386%2Fi387.h;h=6747006743f94f49abf8339cdced9f988ce2e359;hb=e922efc342d565a38eed3af377ff403f52148864;hp=f6feb98a93972e7971662fbe09fec8f247e53fee;hpb=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2;p=linux-2.6

diff --git a/include/asm-i386/i387.h b/include/asm-i386/i387.h
index f6feb98a93..6747006743 100644
--- a/include/asm-i386/i387.h
+++ b/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.fxsave))
 
 extern void kernel_fpu_begin(void);
 #define kernel_fpu_end() do { stts(); preempt_enable(); } while(0)
@@ -32,13 +43,12 @@ extern void kernel_fpu_begin(void);
  */
 static inline void __save_init_fpu( struct task_struct *tsk )
 {
-	if ( cpu_has_fxsr ) {
-		asm volatile( "fxsave %0 ; fnclex"
-			      : "=m" (tsk->thread.i387.fxsave) );
-	} else {
-		asm volatile( "fnsave %0 ; fwait"
-			      : "=m" (tsk->thread.i387.fsave) );
-	}
+	alternative_input(
+		"fnsave %1 ; fwait ;" GENERIC_NOP2,
+		"fxsave %1 ; fnclex",
+		X86_FEATURE_FXSR,
+		"m" (tsk->thread.i387.fxsave)
+		:"memory");
 	tsk->thread_info->status &= ~TS_USEDFPU;
 }