diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index a6098997a14b..705fcbe6f500 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -590,8 +590,8 @@ void do_trace_rcu_torture_read(const char *rcutorturename,
 #endif
 static inline void rcu_gp_set_torture_wait(int duration) { }
 #endif
-unsigned long rcutorture_gather_gp_seqs(void);
-void rcutorture_format_gp_seqs(unsigned long seqs, char *cp);
+unsigned long long rcutorture_gather_gp_seqs(void);
+void rcutorture_format_gp_seqs(unsigned long long seqs, char *cp);
 
 #ifdef CONFIG_TINY_SRCU
 
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 2113583cae34..fb1b80498ae0 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -273,8 +273,8 @@ struct rt_read_seg {
 	bool rt_preempted;
 	int rt_cpu;
 	int rt_end_cpu;
-	unsigned long rt_gp_seq;
-	unsigned long rt_gp_seq_end;
+	unsigned long long rt_gp_seq;
+	unsigned long long rt_gp_seq_end;
 };
 static int err_segs_recorded;
 static struct rt_read_seg err_segs[RCUTORTURE_RDR_MAX_SEGS];
@@ -409,8 +409,8 @@ struct rcu_torture_ops {
 	void (*gp_slow_register)(atomic_t *rgssp);
 	void (*gp_slow_unregister)(atomic_t *rgssp);
 	bool (*reader_blocked)(void);
-	unsigned long (*gather_gp_seqs)(void);
-	void (*format_gp_seqs)(unsigned long seqs, char *cp);
+	unsigned long long (*gather_gp_seqs)(void);
+	void (*format_gp_seqs)(unsigned long long seqs, char *cp);
 	long cbflood_max;
 	int irq_capable;
 	int can_boost;
@@ -3678,8 +3678,8 @@ rcu_torture_cleanup(void)
 			}
 			if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_LOG_GP) &&
 			    cur_ops->gather_gp_seqs && cur_ops->format_gp_seqs) {
-				char buf1[16+1];
-				char buf2[16+1];
+				char buf1[20+1];
+				char buf2[20+1];
 				char sepchar = '-';
 
 				cur_ops->format_gp_seqs(err_segs[i].rt_gp_seq, buf1);
diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c
index f9c4a24dc59c..8cbec3401184 100644
--- a/kernel/rcu/tiny.c
+++ b/kernel/rcu/tiny.c
@@ -258,15 +258,15 @@ EXPORT_SYMBOL_GPL(kvfree_call_rcu);
 #endif
 
 #if IS_ENABLED(CONFIG_RCU_TORTURE_TEST)
-unsigned long rcutorture_gather_gp_seqs(void)
+unsigned long long rcutorture_gather_gp_seqs(void)
 {
-	return READ_ONCE(rcu_ctrlblk.gp_seq) & 0xff;
+	return READ_ONCE(rcu_ctrlblk.gp_seq) & 0xffffULL;
 }
 EXPORT_SYMBOL_GPL(rcutorture_gather_gp_seqs);
 
-void rcutorture_format_gp_seqs(unsigned long seqs, char *cp)
+void rcutorture_format_gp_seqs(unsigned long long seqs, char *cp)
 {
-	snprintf(cp, 8, "g%02lx", seqs & 0xff);
+	snprintf(cp, 8, "g%04llx", seqs & 0xffffULL);
 }
 EXPORT_SYMBOL_GPL(rcutorture_format_gp_seqs);
 #endif
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index e40c4b5c3267..83cba3d2cc48 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -539,22 +539,22 @@ void rcutorture_get_gp_data(int *flags, unsigned long *gp_seq)
 EXPORT_SYMBOL_GPL(rcutorture_get_gp_data);
 
 /* Gather grace-period sequence numbers for rcutorture diagnostics. */
-unsigned long rcutorture_gather_gp_seqs(void)
+unsigned long long rcutorture_gather_gp_seqs(void)
 {
-	return ((READ_ONCE(rcu_state.gp_seq) & 0xff) << 16) |
-	       ((READ_ONCE(rcu_state.expedited_sequence) & 0xff) << 8) |
-	       (READ_ONCE(rcu_state.gp_seq_polled) & 0xff);
+	return ((READ_ONCE(rcu_state.gp_seq) & 0xffffULL) << 40) |
+	       ((READ_ONCE(rcu_state.expedited_sequence) & 0xffffffULL) << 16) |
+	       (READ_ONCE(rcu_state.gp_seq_polled) & 0xffffULL);
 }
 EXPORT_SYMBOL_GPL(rcutorture_gather_gp_seqs);
 
 /* Format grace-period sequence numbers for rcutorture diagnostics. */
-void rcutorture_format_gp_seqs(unsigned long seqs, char *cp)
+void rcutorture_format_gp_seqs(unsigned long long seqs, char *cp)
 {
-	unsigned int egp = (seqs >> 8) & 0xff;
-	unsigned int ggp = (seqs >> 16) & 0xff;
-	unsigned int pgp = seqs & 0xff;
+	unsigned int egp = (seqs >> 16) & 0xffffffULL;
+	unsigned int ggp = (seqs >> 40) & 0xffffULL;
+	unsigned int pgp = seqs & 0xffffULL;
 
-	snprintf(cp, 16, "g%02x:e%02x:p%02x", ggp, egp, pgp);
+	snprintf(cp, 20, "g%04x:e%06x:p%04x", ggp, egp, pgp);
 }
 EXPORT_SYMBOL_GPL(rcutorture_format_gp_seqs);