diff options
Diffstat (limited to 'arch/x86/include/asm/fpu-internal.h')
| -rw-r--r-- | arch/x86/include/asm/fpu-internal.h | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/arch/x86/include/asm/fpu-internal.h b/arch/x86/include/asm/fpu-internal.h index c49a613c645..115e3689cd5 100644 --- a/arch/x86/include/asm/fpu-internal.h +++ b/arch/x86/include/asm/fpu-internal.h @@ -87,22 +87,22 @@ static inline int is_x32_frame(void) static __always_inline __pure bool use_eager_fpu(void) { - return static_cpu_has(X86_FEATURE_EAGER_FPU); + return static_cpu_has_safe(X86_FEATURE_EAGER_FPU); } static __always_inline __pure bool use_xsaveopt(void) { - return static_cpu_has(X86_FEATURE_XSAVEOPT); + return static_cpu_has_safe(X86_FEATURE_XSAVEOPT); } static __always_inline __pure bool use_xsave(void) { - return static_cpu_has(X86_FEATURE_XSAVE); + return static_cpu_has_safe(X86_FEATURE_XSAVE); } static __always_inline __pure bool use_fxsr(void) { - return static_cpu_has(X86_FEATURE_FXSR); + return static_cpu_has_safe(X86_FEATURE_FXSR); } static inline void fx_finit(struct i387_fxsave_struct *fx) @@ -293,12 +293,13 @@ static inline int restore_fpu_checking(struct task_struct *tsk) /* 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. "m" 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" (tsk->thread.fpu.has_fpu)); + if (unlikely(static_cpu_has_safe(X86_FEATURE_FXSAVE_LEAK))) { + asm volatile( + "fnclex\n\t" + "emms\n\t" + "fildl %P[addr]" /* set F?P to defined value */ + : : [addr] "m" (tsk->thread.fpu.has_fpu)); + } return fpu_restore_checking(&tsk->thread.fpu); } |