--- gnumach/kern/thread.c	2019-09-03 01:22:10.932747830 +0200
+++ GNUMach_SMP/kern/thread.c	2019-10-27 19:42:15.360761959 +0100
@@ -1500,11 +1500,11 @@
 	if (flavor == THREAD_BASIC_INFO) {
 	    thread_basic_info_t	basic_info;
 
-	    /* Allow *thread_info_count to be one smaller than the
-	       usual amount, because creation_time is a new member
-	       that some callers might not know about. */
+	    /* Allow *thread_info_count to be two smaller than the
+	       usual amount, because creation_time and last_processor
+		   are new members that some callers might not know about. */
 
-	    if (*thread_info_count < THREAD_BASIC_INFO_COUNT - 1) {
+	    if (*thread_info_count < THREAD_BASIC_INFO_COUNT - 2) {
 		return KERN_INVALID_ARGUMENT;
 	    }
 
@@ -1530,6 +1530,17 @@
 	    read_time_stamp(&thread->creation_time,
 			    &basic_info->creation_time);
 
+		/* Check if the basic_info includes all new members (including last_processor) */
+		if (*thread_info_count == THREAD_BASIC_INFO_COUNT) {
+
+		#if NCPUS > 1
+		basic_info->last_processor = thread->last_processor;
+		#else
+		basic_info->last_processor = 0;
+		#endif
+
+		}
+
 	    /*
 	     *	To calculate cpu_usage, first correct for timer rate,
 	     *	then for 5/8 ageing.  The correction factor [3/5] is