x86/fpu: Use a symbolic name for asm operand

Fix up the else-case in fpu_fxsave() which seems like it has
been overlooked. Correct comment style in restore_fpu_checking()
while at it.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1419170543-11393-1-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/include/asm/fpu-internal.h

@@ -207,7 +207,7 @@ static inline void fpu_fxsave(struct fpu *fpu)
 	if (config_enabled(CONFIG_X86_32))
 		asm volatile( "fxsave %[fx]" : [fx] "=m" (fpu->state->fxsave));
 	else if (config_enabled(CONFIG_AS_FXSAVEQ))
-		asm volatile("fxsaveq %0" : "=m" (fpu->state->fxsave));
+		asm volatile("fxsaveq %[fx]" : [fx] "=m" (fpu->state->fxsave));
 	else {
 		/* Using "rex64; fxsave %0" is broken because, if the memory
 		 * operand uses any extended registers for addressing, a second
@@ -290,9 +290,11 @@ static inline int fpu_restore_checking(struct fpu *fpu)
 
 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 */
+	/*
+	 * 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.
+	 */
 	if (unlikely(static_cpu_has_bug_safe(X86_BUG_FXSAVE_LEAK))) {
 		asm volatile(
 			"fnclex\n\t"