+extern int init_fpu(struct task_struct *child);
+
+static inline int xrstor_checking(struct xsave_struct *fx)
+{
+ int err;
+
+ asm volatile("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n\t"
+ "2:\n"
+ ".section .fixup,\"ax\"\n"
+ "3: movl $-1,%[err]\n"
+ " jmp 2b\n"
+ ".previous\n"
+ _ASM_EXTABLE(1b, 3b)
+ : [err] "=r" (err)
+ : "D" (fx), "m" (*fx), "a" (-1), "d" (-1), "0" (0)
+ : "memory");
+
+ return err;
+}
+
+static inline void xsave(struct task_struct *tsk)
+{
+ /* This, however, we can work around by forcing the compiler to select
+ an addressing mode that doesn't require extended registers. */
+ __asm__ __volatile__(".byte " REX_PREFIX "0x0f,0xae,0x27"
+ : : "D" (&(tsk->thread.xstate->xsave)),
+ "a" (-1), "d"(-1) : "memory");
+}