x86: use user_mode macro

Instead of using SEGMENT_IS_KERNEL_CODE, use the
"user_mode" macro, which can play the same role. Delete
the former, since it now lacks any user.
Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/time_32.c

@@ -47,7 +47,7 @@ unsigned long profile_pc(struct pt_regs *regs)
 	unsigned long pc = instruction_pointer(regs);
 
 #ifdef CONFIG_SMP
-	if (!v8086_mode(regs) && SEGMENT_IS_KERNEL_CODE(regs->cs) &&
+	if (!v8086_mode(regs) && !user_mode(regs) &&
 	    in_lock_functions(pc)) {
 #ifdef CONFIG_FRAME_POINTER
 		return *(unsigned long *)(regs->bp + 4);

include/asm-x86/segment.h

@@ -131,9 +131,6 @@
  * Matching rules for certain types of segments.
  */
 
-/* Matches only __KERNEL_CS, ignoring PnP / USER / APM segments */
-#define SEGMENT_IS_KERNEL_CODE(x) (((x) & 0xfc) == GDT_ENTRY_KERNEL_CS * 8)
-
 /* Matches __KERNEL_CS and __USER_CS (they must be 2 entries apart) */
 #define SEGMENT_IS_FLAT_CODE(x)  (((x) & 0xec) == GDT_ENTRY_KERNEL_CS * 8)