x86/fpu: Rename __thread_fpu_begin() to fpregs_activate()

Propagate the 'fpu->fpregs_active' naming to the high level
function that sets it.

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>
diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h
index 7a23517..18a6223 100644
--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -342,7 +342,7 @@
 		stts();
 }
 
-static inline void __thread_fpu_begin(struct fpu *fpu)
+static inline void fpregs_activate(struct fpu *fpu)
 {
 	if (!use_eager_fpu())
 		clts();
@@ -441,7 +441,7 @@
 				fpu.preload = 0;
 			else
 				prefetch(new_fpu->state);
-			__thread_fpu_begin(new_fpu);
+			fpregs_activate(new_fpu);
 		}
 	}
 	return fpu;
@@ -499,7 +499,7 @@
 
 	preempt_disable();
 	if (!user_has_fpu())
-		__thread_fpu_begin(fpu);
+		fpregs_activate(fpu);
 	preempt_enable();
 }