Fix
  arch/x86/kernel/apic/probe_32.c: In function ‘default_setup_apic_routing’:
  arch/x86/kernel/apic/probe_32.c:146:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
      if (!APIC_XAPIC(version)) {
         ^
  arch/x86/kernel/apic/probe_32.c:151:3: note: here
   case X86_VENDOR_HYGON:
   ^~~~
for 32-bit builds.
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190811154036.29805-1-bp@alien8.de
 
                                def_to_bigsmp = 0;
                                break;
                        }
-                       /* If P4 and above fall through */
+                       /* P4 and above */
+                       /* fall through */
                case X86_VENDOR_HYGON:
                case X86_VENDOR_AMD:
                        def_to_bigsmp = 1;