x86/fpu: Rename save_user_xstate() to copy_fpregs_to_sigframe()

Move the naming in line with existing names, so that we now have:

  copy_fpregs_to_fpstate()
  copy_fpstate_to_sigframe()
  copy_fpregs_to_sigframe()

... where each function does what its name suggests.

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/kernel/fpu/xstate.c

@@ -257,7 +257,7 @@ static inline int save_xstate_epilog(void __user *buf, int ia32_frame)
 	return err;
 }
 
-static inline int save_user_xstate(struct xsave_struct __user *buf)
+static inline int copy_fpregs_to_sigframe(struct xsave_struct __user *buf)
 {
 	int err;
 
@@ -312,7 +312,7 @@ int copy_fpstate_to_sigframe(void __user *buf, void __user *buf_fx, int size)
 
 	if (user_has_fpu()) {
 		/* Save the live register state to the user directly. */
-		if (save_user_xstate(buf_fx))
+		if (copy_fpregs_to_sigframe(buf_fx))
 			return -1;
 		/* Update the thread's fxstate to save the fsave header. */
 		if (ia32_fxstate)