i387: move AMD K7/K8 fpu fxsave/fxrstor workaround from save to restore

[platform/adaptation/renesas_rcar/renesas_kernel.git] / arch / x86 / include / asm / i387.h

diff --git a/arch/x86/include/asm/i387.h b/arch/x86/include/asm/i387.h
index 86974c7..01b115d 100644 (file)
--- a/arch/x86/include/asm/i387.h
+++ b/arch/x86/include/asm/i387.h
@@ -211,15 +211,6 @@ static inline void fpu_fxsave(struct fpu *fpu)
 
 #endif /* CONFIG_X86_64 */
 
-/* We need a safe address that is cheap to find and that is already
-   in L1 during context switch. The best choices are unfortunately
-   different for UP and SMP */
-#ifdef CONFIG_SMP
-#define safe_address (__per_cpu_offset[0])
-#else
-#define safe_address (__get_cpu_var(kernel_cpustat).cpustat[CPUTIME_USER])
-#endif
-
 /*
  * These must be called with preempt disabled
  */
@@ -243,16 +234,6 @@ static inline void fpu_save_init(struct fpu *fpu)
 
        if (unlikely(fpu->state->fxsave.swd & X87_FSW_ES))
                asm volatile("fnclex");
-
-       /* AMD K7/K8 CPUs don't save/restore FDP/FIP/FOP unless an exception
-          is pending.  Clear the x87 state here by setting it to fixed
-          values. safe_address is a random variable that should be in L1 */
-       alternative_input(
-               ASM_NOP8 ASM_NOP2,
-               "emms\n\t"              /* clear stack tags */
-               "fildl %P[addr]",       /* set F?P to defined value */
-               X86_FEATURE_FXSAVE_LEAK,
-               [addr] "m" (safe_address));
 }
 
 static inline void __save_init_fpu(struct task_struct *tsk)