Merge tag 'rcu.next.v6.10' of https://github.com/urezki/linux

Pull RCU updates from Uladzislau Rezki:

 - Fix a lockdep complain for lazy-preemptible kernel, remove redundant
   BH disable for TINY_RCU, remove redundant READ_ONCE() in tree.c, fix
   false positives KCSAN splat and fix buffer overflow in the
   print_cpu_stall_info().

 - Misc updates related to bpf, tracing and update the MAINTAINERS file.

 - An improvement of a normal synchronize_rcu() call in terms of
   latency. It maintains a separate track for sync. users only. This
   approach bypasses per-cpu nocb-lists thus sync-users do not depend on
   nocb-list length and how fast regular callbacks are processed.

 - RCU tasks: switch tasks RCU grace periods to sleep at TASK_IDLE
   priority, fix some comments, add some diagnostic warning to the
   exit_tasks_rcu_start() and fix a buffer overflow in the
   show_rcu_tasks_trace_gp_kthread().

 - RCU torture: Increase memory to guest OS, fix a Tasks Rude RCU
   testing, some updates for TREE09, dump mode information to debug GP
   kthread state, remove redundant READ_ONCE(), fix some comments about
   RCU_TORTURE_PIPE_LEN and pipe_count, remove some redundant pointer
   initialization, fix a hung splat task by when the rcutorture tests
   start to exit, fix invalid context warning, add '--do-kvfree'
   parameter to torture test and use slow register unregister callbacks
   only for rcutype test.

* tag 'rcu.next.v6.10' of https://github.com/urezki/linux: (48 commits)
  rcutorture: Use rcu_gp_slow_register/unregister() only for rcutype test
  torture: Scale --do-kvfree test time
  rcutorture: Fix invalid context warning when enable srcu barrier testing
  rcutorture: Make stall-tasks directly exit when rcutorture tests end
  rcutorture: Removing redundant function pointer initialization
  rcutorture: Make rcutorture support print rcu-tasks gp state
  rcutorture: Use the gp_kthread_dbg operation specified by cur_ops
  rcutorture: Re-use value stored to ->rtort_pipe_count instead of re-reading
  rcutorture: Fix rcu_torture_one_read() pipe_count overflow comment
  rcutorture: Remove extraneous rcu_torture_pipe_update_one() READ_ONCE()
  rcu: Allocate WQ with WQ_MEM_RECLAIM bit set
  rcu: Support direct wake-up of synchronize_rcu() users
  rcu: Add a trace event for synchronize_rcu_normal()
  rcu: Reduce synchronize_rcu() latency
  rcu: Fix buffer overflow in print_cpu_stall_info()
  rcu: Mollify sparse with RCU guard
  rcu-tasks: Fix show_rcu_tasks_trace_gp_kthread buffer overflow
  rcu-tasks: Fix the comments for tasks_rcu_exit_srcu_stall_timer
  rcu-tasks: Replace exit_tasks_rcu_start() initialization with WARN_ON_ONCE()
  rcu: Remove redundant CONFIG_PROVE_RCU #if condition
  ...

.mailmap

@@ -467,7 +467,8 @@ Nadia Yvette Chambers <nyc@holomorphy.com> William Lee Irwin III <wli@holomorphy
 Naoya Horiguchi <nao.horiguchi@gmail.com> <n-horiguchi@ah.jp.nec.com>
 Naoya Horiguchi <nao.horiguchi@gmail.com> <naoya.horiguchi@nec.com>
 Nathan Chancellor <nathan@kernel.org> <natechancellor@gmail.com>
-Neeraj Upadhyay <quic_neeraju@quicinc.com> <neeraju@codeaurora.org>
+Neeraj Upadhyay <neeraj.upadhyay@kernel.org> <quic_neeraju@quicinc.com>
+Neeraj Upadhyay <neeraj.upadhyay@kernel.org> <neeraju@codeaurora.org>
 Neil Armstrong <neil.armstrong@linaro.org> <narmstrong@baylibre.com>
 Nguyen Anh Quynh <aquynh@gmail.com>
 Nicholas Piggin <npiggin@gmail.com> <npiggen@suse.de>

Documentation/RCU/whatisRCU.rst

@@ -427,7 +427,7 @@ their assorted primitives.
 
 This section shows a simple use of the core RCU API to protect a
 global pointer to a dynamically allocated structure.  More-typical
-uses of RCU may be found in listRCU.rst, arrayRCU.rst, and NMI-RCU.rst.
+uses of RCU may be found in listRCU.rst and NMI-RCU.rst.
 ::
 
 	struct foo {
@@ -510,8 +510,8 @@ So, to sum up:
 	data item.
 
 See checklist.rst for additional rules to follow when using RCU.
-And again, more-typical uses of RCU may be found in listRCU.rst,
-arrayRCU.rst, and NMI-RCU.rst.
+And again, more-typical uses of RCU may be found in listRCU.rst
+and NMI-RCU.rst.
 
 .. _4_whatisRCU:
 

Documentation/admin-guide/kernel-parameters.txt

@@ -5098,6 +5098,20 @@
 			delay, memory pressure or callback list growing too
 			big.
 
+	rcutree.rcu_normal_wake_from_gp= [KNL]
+			Reduces a latency of synchronize_rcu() call. This approach
+			maintains its own track of synchronize_rcu() callers, so it
+			does not interact with regular callbacks because it does not
+			use a call_rcu[_hurry]() path. Please note, this is for a
+			normal grace period.
+
+			How to enable it:
+
+			echo 1 > /sys/module/rcutree/parameters/rcu_normal_wake_from_gp
+			or pass a boot parameter "rcutree.rcu_normal_wake_from_gp=1"
+
+			Default is 0.
+
 	rcuscale.gp_async= [KNL]
 			Measure performance of asynchronous
 			grace-period primitives such as call_rcu().

MAINTAINERS

@@ -18600,7 +18600,7 @@ F:	tools/testing/selftests/resctrl/
 READ-COPY UPDATE (RCU)
 M:	"Paul E. McKenney" <paulmck@kernel.org>
 M:	Frederic Weisbecker <frederic@kernel.org> (kernel/rcu/tree_nocb.h)
-M:	Neeraj Upadhyay <quic_neeraju@quicinc.com> (kernel/rcu/tasks.h)
+M:	Neeraj Upadhyay <neeraj.upadhyay@kernel.org> (kernel/rcu/tasks.h)
 M:	Joel Fernandes <joel@joelfernandes.org>
 M:	Josh Triplett <josh@joshtriplett.org>
 M:	Boqun Feng <boqun.feng@gmail.com>

arch/Kconfig

@@ -63,7 +63,7 @@ config KPROBES
 	depends on MODULES
 	depends on HAVE_KPROBES
 	select KALLSYMS
-	select TASKS_RCU if PREEMPTION
+	select NEED_TASKS_RCU
 	help
 	  Kprobes allows you to trap at almost any kernel address and
 	  execute a callback function.  register_kprobe() establishes
@@ -112,7 +112,7 @@ config STATIC_CALL_SELFTEST
 config OPTPROBES
 	def_bool y
 	depends on KPROBES && HAVE_OPTPROBES
-	select TASKS_RCU if PREEMPTION
+	select NEED_TASKS_RCU
 
 config KPROBES_ON_FTRACE
 	def_bool y

include/linux/rcupdate.h

@@ -401,15 +401,15 @@ static inline int debug_lockdep_rcu_enabled(void)
 		}							\
 	} while (0)
 
-#if defined(CONFIG_PROVE_RCU) && !defined(CONFIG_PREEMPT_RCU)
+#ifndef CONFIG_PREEMPT_RCU
 static inline void rcu_preempt_sleep_check(void)
 {
 	RCU_LOCKDEP_WARN(lock_is_held(&rcu_lock_map),
 			 "Illegal context switch in RCU read-side critical section");
 }
-#else /* #ifdef CONFIG_PROVE_RCU */
+#else // #ifndef CONFIG_PREEMPT_RCU
 static inline void rcu_preempt_sleep_check(void) { }
-#endif /* #else #ifdef CONFIG_PROVE_RCU */
+#endif // #else // #ifndef CONFIG_PREEMPT_RCU
 
 #define rcu_sleep_check()						\
 	do {								\
@@ -809,9 +809,9 @@ static inline void rcu_read_unlock(void)
 {
 	RCU_LOCKDEP_WARN(!rcu_is_watching(),
 			 "rcu_read_unlock() used illegally while idle");
+	rcu_lock_release(&rcu_lock_map); /* Keep acq info for rls diags. */
 	__release(RCU);
 	__rcu_read_unlock();
-	rcu_lock_release(&rcu_lock_map); /* Keep acq info for rls diags. */
 }
 
 /**
@@ -1090,6 +1090,18 @@ rcu_head_after_call_rcu(struct rcu_head *rhp, rcu_callback_t f)
 extern int rcu_expedited;
 extern int rcu_normal;
 
-DEFINE_LOCK_GUARD_0(rcu, rcu_read_lock(), rcu_read_unlock())
+DEFINE_LOCK_GUARD_0(rcu,
+	do {
+		rcu_read_lock();
+		/*
+		 * sparse doesn't call the cleanup function,
+		 * so just release immediately and don't track
+		 * the context. We don't need to anyway, since
+		 * the whole point of the guard is to not need
+		 * the explicit unlock.
+		 */
+		__release(RCU);
+	} while (0),
+	rcu_read_unlock())
 
 #endif /* __LINUX_RCUPDATE_H */

include/linux/rcupdate_wait.h

@@ -19,18 +19,18 @@ struct rcu_synchronize {
 };
 void wakeme_after_rcu(struct rcu_head *head);
 
-void __wait_rcu_gp(bool checktiny, int n, call_rcu_func_t *crcu_array,
+void __wait_rcu_gp(bool checktiny, unsigned int state, int n, call_rcu_func_t *crcu_array,
 		   struct rcu_synchronize *rs_array);
 
-#define _wait_rcu_gp(checktiny, ...) \
+#define _wait_rcu_gp(checktiny, state, ...) \
 do {												\
 	call_rcu_func_t __crcu_array[] = { __VA_ARGS__ };					\
 	struct rcu_synchronize __rs_array[ARRAY_SIZE(__crcu_array)];				\
-	__wait_rcu_gp(checktiny, ARRAY_SIZE(__crcu_array),		\
-			__crcu_array, __rs_array);			\
+	__wait_rcu_gp(checktiny, state, ARRAY_SIZE(__crcu_array), __crcu_array, __rs_array);	\
 } while (0)
 
-#define wait_rcu_gp(...) _wait_rcu_gp(false, __VA_ARGS__)
+#define wait_rcu_gp(...) _wait_rcu_gp(false, TASK_UNINTERRUPTIBLE, __VA_ARGS__)
+#define wait_rcu_gp_state(state, ...) _wait_rcu_gp(false, state, __VA_ARGS__)
 
 /**
  * synchronize_rcu_mult - Wait concurrently for multiple grace periods
@@ -54,7 +54,7 @@ do {									\
  * grace period.
  */
 #define synchronize_rcu_mult(...) \
-	_wait_rcu_gp(IS_ENABLED(CONFIG_TINY_RCU), __VA_ARGS__)
+	_wait_rcu_gp(IS_ENABLED(CONFIG_TINY_RCU), TASK_UNINTERRUPTIBLE, __VA_ARGS__)
 
 static inline void cond_resched_rcu(void)
 {

include/linux/srcutiny.h

@@ -64,8 +64,10 @@ static inline int __srcu_read_lock(struct srcu_struct *ssp)
 {
 	int idx;
 
+	preempt_disable();  // Needed for PREEMPT_AUTO
 	idx = ((READ_ONCE(ssp->srcu_idx) + 1) & 0x2) >> 1;
 	WRITE_ONCE(ssp->srcu_lock_nesting[idx], READ_ONCE(ssp->srcu_lock_nesting[idx]) + 1);
+	preempt_enable();
 	return idx;
 }
 

include/trace/events/rcu.h

@@ -707,6 +707,33 @@ TRACE_EVENT_RCU(rcu_invoke_kfree_bulk_callback,
 		__entry->rcuname, __entry->p, __entry->nr_records)
 );
 
+/*
+ * Tracepoint for a normal synchronize_rcu() states. The first argument
+ * is the RCU flavor, the second argument is a pointer to rcu_head the
+ * last one is an event.
+ */
+TRACE_EVENT_RCU(rcu_sr_normal,
+
+	TP_PROTO(const char *rcuname, struct rcu_head *rhp, const char *srevent),
+
+	TP_ARGS(rcuname, rhp, srevent),
+
+	TP_STRUCT__entry(
+		__field(const char *, rcuname)
+		__field(void *, rhp)
+		__field(const char *, srevent)
+	),
+
+	TP_fast_assign(
+		__entry->rcuname = rcuname;
+		__entry->rhp = rhp;
+		__entry->srevent = srevent;
+	),
+
+	TP_printk("%s rhp=0x%p event=%s",
+		__entry->rcuname, __entry->rhp, __entry->srevent)
+);
+
 /*
  * Tracepoint for exiting rcu_do_batch after RCU callbacks have been
  * invoked.  The first argument is the name of the RCU flavor,

kernel/bpf/Kconfig

@@ -28,7 +28,7 @@ config BPF_SYSCALL
 	bool "Enable bpf() system call"
 	select BPF
 	select IRQ_WORK
-	select TASKS_RCU if PREEMPTION
+	select NEED_TASKS_RCU
 	select TASKS_TRACE_RCU
 	select BINARY_PRINTF
 	select NET_SOCK_MSG if NET

kernel/bpf/trampoline.c

@@ -333,7 +333,7 @@ static void bpf_tramp_image_put(struct bpf_tramp_image *im)
 		int err = bpf_arch_text_poke(im->ip_after_call, BPF_MOD_JUMP,
 					     NULL, im->ip_epilogue);
 		WARN_ON(err);
-		if (IS_ENABLED(CONFIG_PREEMPTION))
+		if (IS_ENABLED(CONFIG_TASKS_RCU))
 			call_rcu_tasks(&im->rcu, __bpf_tramp_image_put_rcu_tasks);
 		else
 			percpu_ref_kill(&im->pcref);

kernel/rcu/Kconfig

@@ -31,7 +31,7 @@ config PREEMPT_RCU
 
 config TINY_RCU
 	bool
-	default y if !PREEMPTION && !SMP
+	default y if !PREEMPT_RCU && !SMP
 	help
 	  This option selects the RCU implementation that is
 	  designed for UP systems from which real-time response
@@ -85,9 +85,13 @@ config FORCE_TASKS_RCU
 	  idle, and user-mode execution as quiescent states.  Not for
 	  manual selection in most cases.
 
-config TASKS_RCU
+config NEED_TASKS_RCU
 	bool
 	default n
+
+config TASKS_RCU
+	bool
+	default NEED_TASKS_RCU && (PREEMPTION || PREEMPT_AUTO)
 	select IRQ_WORK
 
 config FORCE_TASKS_RUDE_RCU

kernel/rcu/rcu.h

@@ -522,12 +522,18 @@ static inline void show_rcu_tasks_gp_kthreads(void) {}
 
 #ifdef CONFIG_TASKS_RCU
 struct task_struct *get_rcu_tasks_gp_kthread(void);
+void rcu_tasks_get_gp_data(int *flags, unsigned long *gp_seq);
 #endif // # ifdef CONFIG_TASKS_RCU
 
 #ifdef CONFIG_TASKS_RUDE_RCU
 struct task_struct *get_rcu_tasks_rude_gp_kthread(void);
+void rcu_tasks_rude_get_gp_data(int *flags, unsigned long *gp_seq);
 #endif // # ifdef CONFIG_TASKS_RUDE_RCU
 
+#ifdef CONFIG_TASKS_TRACE_RCU
+void rcu_tasks_trace_get_gp_data(int *flags, unsigned long *gp_seq);
+#endif
+
 #ifdef CONFIG_TASKS_RCU_GENERIC
 void tasks_cblist_init_generic(void);
 #else /* #ifdef CONFIG_TASKS_RCU_GENERIC */
@@ -557,8 +563,7 @@ static inline void rcu_set_jiffies_lazy_flush(unsigned long j) { }
 #endif
 
 #if defined(CONFIG_TREE_RCU)
-void rcutorture_get_gp_data(enum rcutorture_type test_type, int *flags,
-			    unsigned long *gp_seq);
+void rcutorture_get_gp_data(int *flags, unsigned long *gp_seq);
 void do_trace_rcu_torture_read(const char *rcutorturename,
 			       struct rcu_head *rhp,
 			       unsigned long secs,
@@ -566,8 +571,7 @@ void do_trace_rcu_torture_read(const char *rcutorturename,
 			       unsigned long c);
 void rcu_gp_set_torture_wait(int duration);
 #else
-static inline void rcutorture_get_gp_data(enum rcutorture_type test_type,
-					  int *flags, unsigned long *gp_seq)
+static inline void rcutorture_get_gp_data(int *flags, unsigned long *gp_seq)
 {
 	*flags = 0;
 	*gp_seq = 0;
@@ -587,20 +591,16 @@ static inline void rcu_gp_set_torture_wait(int duration) { }
 
 #ifdef CONFIG_TINY_SRCU
 
-static inline void srcutorture_get_gp_data(enum rcutorture_type test_type,
-					   struct srcu_struct *sp, int *flags,
+static inline void srcutorture_get_gp_data(struct srcu_struct *sp, int *flags,
 					   unsigned long *gp_seq)
 {
-	if (test_type != SRCU_FLAVOR)
-		return;
 	*flags = 0;
 	*gp_seq = sp->srcu_idx;
 }
 
 #elif defined(CONFIG_TREE_SRCU)
 
-void srcutorture_get_gp_data(enum rcutorture_type test_type,
-			     struct srcu_struct *sp, int *flags,
+void srcutorture_get_gp_data(struct srcu_struct *sp, int *flags,
 			     unsigned long *gp_seq);
 
 #endif

kernel/rcu/srcutiny.c

@@ -96,9 +96,12 @@ EXPORT_SYMBOL_GPL(cleanup_srcu_struct);
  */
 void __srcu_read_unlock(struct srcu_struct *ssp, int idx)
 {
-	int newval = READ_ONCE(ssp->srcu_lock_nesting[idx]) - 1;
+	int newval;
 
+	preempt_disable();  // Needed for PREEMPT_AUTO
+	newval = READ_ONCE(ssp->srcu_lock_nesting[idx]) - 1;
 	WRITE_ONCE(ssp->srcu_lock_nesting[idx], newval);
+	preempt_enable();
 	if (!newval && READ_ONCE(ssp->srcu_gp_waiting) && in_task())
 		swake_up_one(&ssp->srcu_wq);
 }
@@ -117,8 +120,11 @@ void srcu_drive_gp(struct work_struct *wp)
 	struct srcu_struct *ssp;
 
 	ssp = container_of(wp, struct srcu_struct, srcu_work);
-	if (ssp->srcu_gp_running || ULONG_CMP_GE(ssp->srcu_idx, READ_ONCE(ssp->srcu_idx_max)))
+	preempt_disable();  // Needed for PREEMPT_AUTO
+	if (ssp->srcu_gp_running || ULONG_CMP_GE(ssp->srcu_idx, READ_ONCE(ssp->srcu_idx_max))) {
 		return; /* Already running or nothing to do. */
+		preempt_enable();
+	}
 
 	/* Remove recently arrived callbacks and wait for readers. */
 	WRITE_ONCE(ssp->srcu_gp_running, true);
@@ -130,9 +136,12 @@ void srcu_drive_gp(struct work_struct *wp)
 	idx = (ssp->srcu_idx & 0x2) / 2;
 	WRITE_ONCE(ssp->srcu_idx, ssp->srcu_idx + 1);
 	WRITE_ONCE(ssp->srcu_gp_waiting, true);  /* srcu_read_unlock() wakes! */
+	preempt_enable();
 	swait_event_exclusive(ssp->srcu_wq, !READ_ONCE(ssp->srcu_lock_nesting[idx]));
+	preempt_disable();  // Needed for PREEMPT_AUTO
 	WRITE_ONCE(ssp->srcu_gp_waiting, false); /* srcu_read_unlock() cheap. */
 	WRITE_ONCE(ssp->srcu_idx, ssp->srcu_idx + 1);
+	preempt_enable();
 
 	/* Invoke the callbacks we removed above. */
 	while (lh) {
@@ -150,8 +159,11 @@ void srcu_drive_gp(struct work_struct *wp)
 	 * at interrupt level, but the ->srcu_gp_running checks will
 	 * straighten that out.
 	 */
+	preempt_disable();  // Needed for PREEMPT_AUTO
 	WRITE_ONCE(ssp->srcu_gp_running, false);
-	if (ULONG_CMP_LT(ssp->srcu_idx, READ_ONCE(ssp->srcu_idx_max)))
+	idx = ULONG_CMP_LT(ssp->srcu_idx, READ_ONCE(ssp->srcu_idx_max));
+	preempt_enable();
+	if (idx)
 		schedule_work(&ssp->srcu_work);
 }
 EXPORT_SYMBOL_GPL(srcu_drive_gp);
@@ -160,9 +172,12 @@ static void srcu_gp_start_if_needed(struct srcu_struct *ssp)
 {
 	unsigned long cookie;
 
+	preempt_disable();  // Needed for PREEMPT_AUTO
 	cookie = get_state_synchronize_srcu(ssp);
-	if (ULONG_CMP_GE(READ_ONCE(ssp->srcu_idx_max), cookie))
+	if (ULONG_CMP_GE(READ_ONCE(ssp->srcu_idx_max), cookie)) {
+		preempt_enable();
 		return;
+	}
 	WRITE_ONCE(ssp->srcu_idx_max, cookie);
 	if (!READ_ONCE(ssp->srcu_gp_running)) {
 		if (likely(srcu_init_done))
@@ -170,6 +185,7 @@ static void srcu_gp_start_if_needed(struct srcu_struct *ssp)
 		else if (list_empty(&ssp->srcu_work.entry))
 			list_add(&ssp->srcu_work.entry, &srcu_boot_list);
 	}
+	preempt_enable();
 }
 
 /*
@@ -183,11 +199,13 @@ void call_srcu(struct srcu_struct *ssp, struct rcu_head *rhp,
 
 	rhp->func = func;
 	rhp->next = NULL;
+	preempt_disable();  // Needed for PREEMPT_AUTO
 	local_irq_save(flags);
 	*ssp->srcu_cb_tail = rhp;
 	ssp->srcu_cb_tail = &rhp->next;
 	local_irq_restore(flags);
 	srcu_gp_start_if_needed(ssp);
+	preempt_enable();
 }
 EXPORT_SYMBOL_GPL(call_srcu);
 
@@ -241,9 +259,12 @@ EXPORT_SYMBOL_GPL(get_state_synchronize_srcu);
  */
 unsigned long start_poll_synchronize_srcu(struct srcu_struct *ssp)
 {
-	unsigned long ret = get_state_synchronize_srcu(ssp);
+	unsigned long ret;
 
+	preempt_disable();  // Needed for PREEMPT_AUTO
+	ret = get_state_synchronize_srcu(ssp);
 	srcu_gp_start_if_needed(ssp);
+	preempt_enable();
 	return ret;
 }
 EXPORT_SYMBOL_GPL(start_poll_synchronize_srcu);

kernel/rcu/srcutree.c

@@ -1826,12 +1826,9 @@ static void process_srcu(struct work_struct *work)
 	srcu_reschedule(ssp, curdelay);
 }
 
-void srcutorture_get_gp_data(enum rcutorture_type test_type,
-			     struct srcu_struct *ssp, int *flags,
+void srcutorture_get_gp_data(struct srcu_struct *ssp, int *flags,
 			     unsigned long *gp_seq)
 {
-	if (test_type != SRCU_FLAVOR)
-		return;
 	*flags = 0;
 	*gp_seq = rcu_seq_current(&ssp->srcu_sup->srcu_gp_seq);
 }

kernel/rcu/sync.c

@@ -122,7 +122,7 @@ void rcu_sync_enter(struct rcu_sync *rsp)
 		 * we are called at early boot time but this shouldn't happen.
 		 */
 	}
-	rsp->gp_count++;
+	WRITE_ONCE(rsp->gp_count, rsp->gp_count + 1);
 	spin_unlock_irq(&rsp->rss_lock);
 
 	if (gp_state == GP_IDLE) {
@@ -151,11 +151,15 @@ void rcu_sync_enter(struct rcu_sync *rsp)
  */
 void rcu_sync_exit(struct rcu_sync *rsp)
 {
+	int gpc;
+
 	WARN_ON_ONCE(READ_ONCE(rsp->gp_state) == GP_IDLE);
 	WARN_ON_ONCE(READ_ONCE(rsp->gp_count) == 0);
 
 	spin_lock_irq(&rsp->rss_lock);
-	if (!--rsp->gp_count) {
+	gpc = rsp->gp_count - 1;
+	WRITE_ONCE(rsp->gp_count, gpc);
+	if (!gpc) {
 		if (rsp->gp_state == GP_PASSED) {
 			WRITE_ONCE(rsp->gp_state, GP_EXIT);
 			rcu_sync_call(rsp);

kernel/rcu/tasks.h

@@ -74,6 +74,7 @@ struct rcu_tasks_percpu {
  * @holdouts_func: This flavor's holdout-list scan function (optional).
  * @postgp_func: This flavor's post-grace-period function (optional).
  * @call_func: This flavor's call_rcu()-equivalent function.
+ * @wait_state: Task state for synchronous grace-period waits (default TASK_UNINTERRUPTIBLE).
  * @rtpcpu: This flavor's rcu_tasks_percpu structure.
  * @percpu_enqueue_shift: Shift down CPU ID this much when enqueuing callbacks.
  * @percpu_enqueue_lim: Number of per-CPU callback queues in use for enqueuing.
@@ -107,6 +108,7 @@ struct rcu_tasks {
 	holdouts_func_t holdouts_func;
 	postgp_func_t postgp_func;
 	call_rcu_func_t call_func;
+	unsigned int wait_state;
 	struct rcu_tasks_percpu __percpu *rtpcpu;
 	int percpu_enqueue_shift;
 	int percpu_enqueue_lim;
@@ -134,6 +136,7 @@ static struct rcu_tasks rt_name =							\
 	.tasks_gp_mutex = __MUTEX_INITIALIZER(rt_name.tasks_gp_mutex),			\
 	.gp_func = gp,									\
 	.call_func = call,								\
+	.wait_state = TASK_UNINTERRUPTIBLE,						\
 	.rtpcpu = &rt_name ## __percpu,							\
 	.lazy_jiffies = DIV_ROUND_UP(HZ, 4),						\
 	.name = n,									\
@@ -147,7 +150,7 @@ static struct rcu_tasks rt_name =							\
 
 #ifdef CONFIG_TASKS_RCU
 
-/* Report delay in synchronize_srcu() completion in rcu_tasks_postscan(). */
+/* Report delay of scan exiting tasklist in rcu_tasks_postscan(). */
 static void tasks_rcu_exit_srcu_stall(struct timer_list *unused);
 static DEFINE_TIMER(tasks_rcu_exit_srcu_stall_timer, tasks_rcu_exit_srcu_stall);
 #endif
@@ -638,7 +641,7 @@ static void synchronize_rcu_tasks_generic(struct rcu_tasks *rtp)
 
 	// If the grace-period kthread is running, use it.
 	if (READ_ONCE(rtp->kthread_ptr)) {
-		wait_rcu_gp(rtp->call_func);
+		wait_rcu_gp_state(rtp->wait_state, rtp->call_func);
 		return;
 	}
 	rcu_tasks_one_gp(rtp, true);
@@ -1160,6 +1163,7 @@ static int __init rcu_spawn_tasks_kthread(void)
 	rcu_tasks.postscan_func = rcu_tasks_postscan;
 	rcu_tasks.holdouts_func = check_all_holdout_tasks;
 	rcu_tasks.postgp_func = rcu_tasks_postgp;
+	rcu_tasks.wait_state = TASK_IDLE;
 	rcu_spawn_tasks_kthread_generic(&rcu_tasks);
 	return 0;
 }
@@ -1178,6 +1182,13 @@ struct task_struct *get_rcu_tasks_gp_kthread(void)
 }
 EXPORT_SYMBOL_GPL(get_rcu_tasks_gp_kthread);
 
+void rcu_tasks_get_gp_data(int *flags, unsigned long *gp_seq)
+{
+	*flags = 0;
+	*gp_seq = rcu_seq_current(&rcu_tasks.tasks_gp_seq);
+}
+EXPORT_SYMBOL_GPL(rcu_tasks_get_gp_data);
+
 /*
  * Protect against tasklist scan blind spot while the task is exiting and
  * may be removed from the tasklist.  Do this by adding the task to yet
@@ -1199,8 +1210,7 @@ void exit_tasks_rcu_start(void)
 	rtpcp = this_cpu_ptr(rcu_tasks.rtpcpu);
 	t->rcu_tasks_exit_cpu = smp_processor_id();
 	raw_spin_lock_irqsave_rcu_node(rtpcp, flags);
-	if (!rtpcp->rtp_exit_list.next)
-		INIT_LIST_HEAD(&rtpcp->rtp_exit_list);
+	WARN_ON_ONCE(!rtpcp->rtp_exit_list.next);
 	list_add(&t->rcu_tasks_exit_list, &rtpcp->rtp_exit_list);
 	raw_spin_unlock_irqrestore_rcu_node(rtpcp, flags);
 	preempt_enable();
@@ -1358,6 +1368,13 @@ struct task_struct *get_rcu_tasks_rude_gp_kthread(void)
 }
 EXPORT_SYMBOL_GPL(get_rcu_tasks_rude_gp_kthread);
 
+void rcu_tasks_rude_get_gp_data(int *flags, unsigned long *gp_seq)
+{
+	*flags = 0;
+	*gp_seq = rcu_seq_current(&rcu_tasks_rude.tasks_gp_seq);
+}
+EXPORT_SYMBOL_GPL(rcu_tasks_rude_get_gp_data);
+
 #endif /* #ifdef CONFIG_TASKS_RUDE_RCU */
 
 ////////////////////////////////////////////////////////////////////////
@@ -1457,6 +1474,7 @@ static void rcu_st_need_qs(struct task_struct *t, u8 v)
 /*
  * Do a cmpxchg() on ->trc_reader_special.b.need_qs, allowing for
  * the four-byte operand-size restriction of some platforms.
+ *
  * Returns the old value, which is often ignored.
  */
 u8 rcu_trc_cmpxchg_need_qs(struct task_struct *t, u8 old, u8 new)
@@ -1468,7 +1486,14 @@ u8 rcu_trc_cmpxchg_need_qs(struct task_struct *t, u8 old, u8 new)
 	if (trs_old.b.need_qs != old)
 		return trs_old.b.need_qs;
 	trs_new.b.need_qs = new;
-	ret.s = cmpxchg(&t->trc_reader_special.s, trs_old.s, trs_new.s);
+
+	// Although cmpxchg() appears to KCSAN to update all four bytes,
+	// only the .b.need_qs byte actually changes.
+	instrument_atomic_read_write(&t->trc_reader_special.b.need_qs,
+				     sizeof(t->trc_reader_special.b.need_qs));
+	// Avoid false-positive KCSAN failures.
+	ret.s = data_race(cmpxchg(&t->trc_reader_special.s, trs_old.s, trs_new.s));
+
 	return ret.b.need_qs;
 }
 EXPORT_SYMBOL_GPL(rcu_trc_cmpxchg_need_qs);
@@ -1994,7 +2019,7 @@ void show_rcu_tasks_trace_gp_kthread(void)
 {
 	char buf[64];
 
-	sprintf(buf, "N%lu h:%lu/%lu/%lu",
+	snprintf(buf, sizeof(buf), "N%lu h:%lu/%lu/%lu",
 		data_race(n_trc_holdouts),
 		data_race(n_heavy_reader_ofl_updates),
 		data_race(n_heavy_reader_updates),
@@ -2010,6 +2035,13 @@ struct task_struct *get_rcu_tasks_trace_gp_kthread(void)
 }
 EXPORT_SYMBOL_GPL(get_rcu_tasks_trace_gp_kthread);
 
+void rcu_tasks_trace_get_gp_data(int *flags, unsigned long *gp_seq)
+{
+	*flags = 0;
+	*gp_seq = rcu_seq_current(&rcu_tasks_trace.tasks_gp_seq);
+}
+EXPORT_SYMBOL_GPL(rcu_tasks_trace_get_gp_data);
+
 #else /* #ifdef CONFIG_TASKS_TRACE_RCU */
 static void exit_tasks_rcu_finish_trace(struct task_struct *t) { }
 #endif /* #else #ifdef CONFIG_TASKS_TRACE_RCU */

kernel/rcu/tiny.c

@@ -130,9 +130,7 @@ static __latent_entropy void rcu_process_callbacks(struct softirq_action *unused
 		next = list->next;
 		prefetch(next);
 		debug_rcu_head_unqueue(list);
-		local_bh_disable();
 		rcu_reclaim_tiny(list);
-		local_bh_enable();
 		list = next;
 	}
 }
@@ -155,7 +153,9 @@ void synchronize_rcu(void)
 			 lock_is_held(&rcu_lock_map) ||
 			 lock_is_held(&rcu_sched_lock_map),
 			 "Illegal synchronize_rcu() in RCU read-side critical section");
+	preempt_disable();
 	WRITE_ONCE(rcu_ctrlblk.gp_seq, rcu_ctrlblk.gp_seq + 2);
+	preempt_enable();
 }
 EXPORT_SYMBOL_GPL(synchronize_rcu);
 

kernel/rcu/tree.h

@@ -273,9 +273,9 @@ struct rcu_data {
 	bool rcu_iw_pending;		/* Is ->rcu_iw pending? */
 	unsigned long rcu_iw_gp_seq;	/* ->gp_seq associated with ->rcu_iw. */
 	unsigned long rcu_ofl_gp_seq;	/* ->gp_seq at last offline. */
-	short rcu_ofl_gp_flags;		/* ->gp_flags at last offline. */
+	short rcu_ofl_gp_state;		/* ->gp_state at last offline. */
 	unsigned long rcu_onl_gp_seq;	/* ->gp_seq at last online. */
-	short rcu_onl_gp_flags;		/* ->gp_flags at last online. */
+	short rcu_onl_gp_state;		/* ->gp_state at last online. */
 	unsigned long last_fqs_resched;	/* Time of last rcu_resched(). */
 	unsigned long last_sched_clock;	/* Jiffies of last rcu_sched_clock_irq(). */
 	struct rcu_snap_record snap_record; /* Snapshot of core stats at half of */
@@ -315,6 +315,19 @@ do {									\
 	__set_current_state(TASK_RUNNING);				\
 } while (0)
 
+/*
+ * A max threshold for synchronize_rcu() users which are
+ * awaken directly by the rcu_gp_kthread(). Left part is
+ * deferred to the main worker.
+ */
+#define SR_MAX_USERS_WAKE_FROM_GP 5
+#define SR_NORMAL_GP_WAIT_HEAD_MAX 5
+
+struct sr_wait_node {
+	atomic_t inuse;
+	struct llist_node node;
+};
+
 /*
  * RCU global state, including node hierarchy.  This hierarchy is
  * represented in "heap" form in a dense array.  The root (first level)
@@ -400,6 +413,13 @@ struct rcu_state {
 						/* Synchronize offline with */
 						/*  GP pre-initialization. */
 	int nocb_is_setup;			/* nocb is setup from boot */
+
+	/* synchronize_rcu() part. */
+	struct llist_head srs_next;	/* request a GP users. */
+	struct llist_node *srs_wait_tail; /* wait for GP users. */
+	struct llist_node *srs_done_tail; /* ready for GP users. */
+	struct sr_wait_node srs_wait_nodes[SR_NORMAL_GP_WAIT_HEAD_MAX];
+	struct work_struct srs_cleanup_work;
 };
 
 /* Values for rcu_state structure's gp_flags field. */

kernel/rcu/tree_exp.h

@@ -930,7 +930,7 @@ void synchronize_rcu_expedited(void)
 
 	/* If expedited grace periods are prohibited, fall back to normal. */
 	if (rcu_gp_is_normal()) {
-		wait_rcu_gp(call_rcu_hurry);
+		synchronize_rcu_normal();
 		return;
 	}
 

kernel/rcu/tree_plugin.h

@@ -805,8 +805,8 @@ dump_blkd_tasks(struct rcu_node *rnp, int ncheck)
 		rdp = per_cpu_ptr(&rcu_data, cpu);
 		pr_info("\t%d: %c online: %ld(%d) offline: %ld(%d)\n",
 			cpu, ".o"[rcu_rdp_cpu_online(rdp)],
-			(long)rdp->rcu_onl_gp_seq, rdp->rcu_onl_gp_flags,
-			(long)rdp->rcu_ofl_gp_seq, rdp->rcu_ofl_gp_flags);
+			(long)rdp->rcu_onl_gp_seq, rdp->rcu_onl_gp_state,
+			(long)rdp->rcu_ofl_gp_seq, rdp->rcu_ofl_gp_state);
 	}
 }
 

kernel/rcu/tree_stall.h

@@ -504,7 +504,8 @@ static void print_cpu_stall_info(int cpu)
 			rcu_dynticks_in_eqs(rcu_dynticks_snap(cpu));
 	rcuc_starved = rcu_is_rcuc_kthread_starving(rdp, &j);
 	if (rcuc_starved)
-		sprintf(buf, " rcuc=%ld jiffies(starved)", j);
+		// Print signed value, as negative values indicate a probable bug.
+		snprintf(buf, sizeof(buf), " rcuc=%ld jiffies(starved)", j);
 	pr_err("\t%d-%c%c%c%c: (%lu %s) idle=%04x/%ld/%#lx softirq=%u/%u fqs=%ld%s%s\n",
 	       cpu,
 	       "O."[!!cpu_online(cpu)],
@@ -579,7 +580,7 @@ static void rcu_check_gp_kthread_expired_fqs_timer(void)
 		pr_err("%s kthread timer wakeup didn't happen for %ld jiffies! g%ld f%#x %s(%d) ->state=%#x\n",
 		       rcu_state.name, (jiffies - jiffies_fqs),
 		       (long)rcu_seq_current(&rcu_state.gp_seq),
-		       data_race(rcu_state.gp_flags),
+		       data_race(READ_ONCE(rcu_state.gp_flags)), // Diagnostic read
 		       gp_state_getname(RCU_GP_WAIT_FQS), RCU_GP_WAIT_FQS,
 		       data_race(READ_ONCE(gpk->__state)));
 		pr_err("\tPossible timer handling issue on cpu=%d timer-softirq=%u\n",
@@ -628,7 +629,8 @@ static void print_other_cpu_stall(unsigned long gp_seq, unsigned long gps)
 		totqlen += rcu_get_n_cbs_cpu(cpu);
 	pr_err("\t(detected by %d, t=%ld jiffies, g=%ld, q=%lu ncpus=%d)\n",
 	       smp_processor_id(), (long)(jiffies - gps),
-	       (long)rcu_seq_current(&rcu_state.gp_seq), totqlen, rcu_state.n_online_cpus);
+	       (long)rcu_seq_current(&rcu_state.gp_seq), totqlen,
+	       data_race(rcu_state.n_online_cpus)); // Diagnostic read
 	if (ndetected) {
 		rcu_dump_cpu_stacks();
 
@@ -689,7 +691,8 @@ static void print_cpu_stall(unsigned long gps)
 		totqlen += rcu_get_n_cbs_cpu(cpu);
 	pr_err("\t(t=%lu jiffies g=%ld q=%lu ncpus=%d)\n",
 		jiffies - gps,
-		(long)rcu_seq_current(&rcu_state.gp_seq), totqlen, rcu_state.n_online_cpus);
+		(long)rcu_seq_current(&rcu_state.gp_seq), totqlen,
+		data_race(rcu_state.n_online_cpus)); // Diagnostic read
 
 	rcu_check_gp_kthread_expired_fqs_timer();
 	rcu_check_gp_kthread_starvation();

kernel/rcu/update.c

@@ -408,7 +408,7 @@ void wakeme_after_rcu(struct rcu_head *head)
 }
 EXPORT_SYMBOL_GPL(wakeme_after_rcu);
 
-void __wait_rcu_gp(bool checktiny, int n, call_rcu_func_t *crcu_array,
+void __wait_rcu_gp(bool checktiny, unsigned int state, int n, call_rcu_func_t *crcu_array,
 		   struct rcu_synchronize *rs_array)
 {
 	int i;
@@ -440,7 +440,7 @@ void __wait_rcu_gp(bool checktiny, int n, call_rcu_func_t *crcu_array,
 			if (crcu_array[j] == crcu_array[i])
 				break;
 		if (j == i) {
-			wait_for_completion(&rs_array[i].completion);
+			wait_for_completion_state(&rs_array[i].completion, state);
 			destroy_rcu_head_on_stack(&rs_array[i].head);
 		}
 	}

kernel/trace/Kconfig

@@ -163,7 +163,7 @@ config TRACING
 	select BINARY_PRINTF
 	select EVENT_TRACING
 	select TRACE_CLOCK
-	select TASKS_RCU if PREEMPTION
+	select NEED_TASKS_RCU
 
 config GENERIC_TRACER
 	bool
@@ -204,7 +204,7 @@ config FUNCTION_TRACER
 	select GENERIC_TRACER
 	select CONTEXT_SWITCH_TRACER
 	select GLOB
-	select TASKS_RCU if PREEMPTION
+	select NEED_TASKS_RCU
 	select TASKS_RUDE_RCU
 	help
 	  Enable the kernel to trace every kernel function. This is done

kernel/trace/ftrace.c

@@ -3157,7 +3157,6 @@ int ftrace_shutdown(struct ftrace_ops *ops, int command)
 		 * synchronize_rcu_tasks() will wait for those tasks to
 		 * execute and either schedule voluntarily or enter user space.
 		 */
-		if (IS_ENABLED(CONFIG_PREEMPTION))
 		synchronize_rcu_tasks();
 
 		ftrace_trampoline_free(ops);

tools/testing/selftests/rcutorture/bin/torture.sh

@@ -391,7 +391,7 @@ __EOF__
 		forceflavor="`echo $flavor | sed -e 's/^CONFIG/CONFIG_FORCE/'`"
 		deselectedflavors="`grep -v $flavor $T/rcutasksflavors | tr '\012' ' ' | tr -s ' ' | sed -e 's/ *$//'`"
 		echo " --- Running RCU Tasks Trace flavor $flavor `date`" >> $rtfdir/log
-		tools/testing/selftests/rcutorture/bin/kvm.sh --datestamp "$ds/results-rcutasksflavors/$flavor" --buildonly --configs "TINY01 TREE04" --kconfig "CONFIG_RCU_EXPERT=y CONFIG_RCU_SCALE_TEST=y $forceflavor=y $deselectedflavors" --trust-make > $T/$flavor.out 2>&1
+		tools/testing/selftests/rcutorture/bin/kvm.sh --datestamp "$ds/results-rcutasksflavors/$flavor" --buildonly --configs "TINY01 TREE04" --kconfig "CONFIG_RCU_EXPERT=y CONFIG_RCU_SCALE_TEST=y CONFIG_KPROBES=n CONFIG_RCU_TRACE=n CONFIG_TRACING=n CONFIG_BLK_DEV_IO_TRACE=n CONFIG_UPROBE_EVENTS=n $forceflavor=y $deselectedflavors" --trust-make > $T/$flavor.out 2>&1
 		retcode=$?
 		if test "$retcode" -ne 0
 		then
@@ -425,7 +425,7 @@ fi
 if test "$do_scftorture" = "yes"
 then
 	# Scale memory based on the number of CPUs.
-	scfmem=$((2+HALF_ALLOTED_CPUS/16))
+	scfmem=$((3+HALF_ALLOTED_CPUS/16))
 	torture_bootargs="scftorture.nthreads=$HALF_ALLOTED_CPUS torture.disable_onoff_at_boot csdlock_debug=1"
 	torture_set "scftorture" tools/testing/selftests/rcutorture/bin/kvm.sh --torture scf --allcpus --duration "$duration_scftorture" --configs "$configs_scftorture" --kconfig "CONFIG_NR_CPUS=$HALF_ALLOTED_CPUS" --memory ${scfmem}G --trust-make
 fi
@@ -559,7 +559,7 @@ do_kcsan="$do_kcsan_save"
 if test "$do_kvfree" = "yes"
 then
 	torture_bootargs="rcuscale.kfree_rcu_test=1 rcuscale.kfree_nthreads=16 rcuscale.holdoff=20 rcuscale.kfree_loops=10000 torture.disable_onoff_at_boot"
-	torture_set "rcuscale-kvfree" tools/testing/selftests/rcutorture/bin/kvm.sh --torture rcuscale --allcpus --duration 10 --kconfig "CONFIG_NR_CPUS=$HALF_ALLOTED_CPUS" --memory 2G --trust-make
+	torture_set "rcuscale-kvfree" tools/testing/selftests/rcutorture/bin/kvm.sh --torture rcuscale --allcpus --duration $duration_rcutorture --kconfig "CONFIG_NR_CPUS=$HALF_ALLOTED_CPUS" --memory 2G --trust-make
 fi
 
 if test "$do_clocksourcewd" = "yes"

tools/testing/selftests/rcutorture/configs/rcu/TREE09

@@ -10,8 +10,9 @@ CONFIG_NO_HZ_FULL=n
 CONFIG_RCU_TRACE=n
 CONFIG_RCU_NOCB_CPU=n
 CONFIG_DEBUG_LOCK_ALLOC=n
-CONFIG_RCU_BOOST=n
+CONFIG_RCU_BOOST=y
+CONFIG_RCU_BOOST_DELAY=100
 CONFIG_DEBUG_OBJECTS_RCU_HEAD=n
-#CHECK#CONFIG_RCU_EXPERT=n
+CONFIG_RCU_EXPERT=y
 CONFIG_KPROBES=n
 CONFIG_FTRACE=n