x86/fpu: Remove fpu_xsave()

It's a pointless wrapper now - use xsave_state().

Reviewed-by: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
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/include/asm/fpu-internal.h

@@ -265,7 +265,7 @@ static inline void fpu_fxsave(struct fpu *fpu)
 static inline int fpu_save_init(struct fpu *fpu)
 {
 	if (use_xsave()) {
-		fpu_xsave(fpu);
+		xsave_state(&fpu->state->xsave);
 
 		/*
 		 * xsave header may indicate the init state of the FP.

arch/x86/include/asm/xsave.h

@@ -186,14 +186,6 @@ static inline int xrstor_state(struct xsave_struct *fx, u64 mask)
 	return err;
 }
 
-/*
- * Save xstate context for old process during context switch.
- */
-static inline void fpu_xsave(struct fpu *fpu)
-{
-	xsave_state(&fpu->state->xsave);
-}
-
 /*
  * Restore xstate context for new process during context switch.
  */

arch/x86/mm/mpx.c

@@ -389,7 +389,7 @@ int mpx_enable_management(struct task_struct *tsk)
 	 * directory into XSAVE/XRSTOR Save Area and enable MPX through
 	 * XRSTOR instruction.
 	 *
-	 * fpu_xsave() is expected to be very expensive. Storing the bounds
+	 * xsave_state() is expected to be very expensive. Storing the bounds
 	 * directory here means that we do not have to do xsave in the unmap
 	 * path; we can just use mm->bd_addr instead.
 	 */