Merge tag 'rcu.2026.08.18a' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux

Pull RCU updates from Paul McKenney:
 "Make expedited grace periods expedite normal RCU callbacks

  Miscellaneous fixes:
   - Improve diagnostic output with character task states
   - Mark accesses to inform KCSAN of concurrency design
   - Move from kmalloc() to kmalloc_obj()
   - Documentation updates
   - Improve handling of RCU deferred quiescent states
   - Clean up unused function arguments and structure fields
   - Reduce show_rcu_gp_kthreads() stack space

  Tasks RCU updates:
   - Clean up after SRCU re-implementation of Tasks Trace RCU
   - Mark accesses to inform KCSAN of concurrency design
   - Add ->lazy_timer status to diagnostic output
   - Remove an unnecessary memory barrier
   - Fix a data race, courtesy of KCSAN
   - Documentation updates
   - Convert cond_resched_tasks_rcu_qs() from macro to static inline
     function

  SRCU updates:
   - Add Rust helpers for SRCU
   - Avoid losing queued work at cleanup_srcu_struct() time

  Torture-test updates:
   - Preparation work for immediate RCU priority deboosting
   - Test RCU readers from real interrupt handlers (as opposed to
     softirq)
   - Simplify code through use of cpumask_next_wrap()
   - Improve diagnostic output with character task states
   - Add rcutorture.nwriters parameter to allow lightweight stall
     testing, and rcutorture.stall_only to make doing so easier
   - Test an RCU Tasks Trace grace period implying an RCU grace period
   - Make RCU Tasks Trace torturing track reader batches
   - Fix a data race, courtesy of KCSAN
   - Plug a shuffle_tmp_mask memory leak on kthread spawn failure"

* tag 'rcu.2026.08.18a' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux: (59 commits)
  rcu: Add closing parenthesis in comment in rcu_read_unlock_strict()
  rcutorture: Make {,s}rcu_read_delay() better handle forward-progress testing
  rcutorture: Announce declining to forward-progress test
  torture: Don't leak shuffle_tmp_mask when shuffler kthread fails to start
  rcutorture: Use this_cpu_inc() for rcu_torture_count[] and rcu_torture_batch[]
  rcutorture: Make RCU Tasks Trace track Reader Batches
  rcutorture: Test RCU Tasks Trace GP implying RCU GP
  rcutorture: Add a stall_only module parameter
  rcutorture: Add nwriters module parameter
  rcutorture: Use task_state_to_char() for task-state reporting
  rcutorture: Use cpumask_next_wrap() in rcu_torture_preempt()
  rcutorture: Test RCU readers from hardware interrupt handlers
  rcutorture: Check for immediate deboosting at reader end
  srcu: Queue sdp->work when the delay timer is successfully deleted
  rcu-tasks: Convert cond_resched_tasks_rcu_qs() to static inline
  rcu-tasks: Fix some comments for call_rcu_tasks() and call_rcu_tasks_rude()
  rcu-tasks: Rename tasks_rcu_exit_srcu_stall_timer to tasks_rcu_exit_stall_timer
  rcu: Mark interrupts-enabled accesses to rdp->cpu_no_qs.s
  rcu: Reduce stack usage in show_rcu_gp_kthreads()
  rcu: Mark accesses to ->rcu_urgent_qs and ->rcu_need_heavy_qs
  ...

1 files changed, 20 insertions, 9 deletions

diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index 72c86d3b23f2..7d9bc06df98d 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -25,20 +25,19 @@ context_lock_struct(srcu_struct, __reentrant_ctx_lock);
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 
-int __init_srcu_struct(struct srcu_struct *ssp, const char *name, struct lock_class_key *key);
+int init_srcu_struct_lockdep(struct srcu_struct *ssp, const char *name,
+				     struct lock_class_key *key);
+static inline int __init_srcu_struct(struct srcu_struct *ssp, const char *name,
+				     struct lock_class_key *key)
+{
+	return init_srcu_struct_lockdep(ssp, name, key);
+}
 #ifndef CONFIG_TINY_SRCU
 int __init_srcu_struct_fast(struct srcu_struct *ssp, const char *name, struct lock_class_key *key);
 int __init_srcu_struct_fast_updown(struct srcu_struct *ssp, const char *name,
 				   struct lock_class_key *key);
 #endif // #ifndef CONFIG_TINY_SRCU
 
-#define init_srcu_struct(ssp) \
-({ \
-	static struct lock_class_key __srcu_key; \
-	\
-	__init_srcu_struct((ssp), #ssp, &__srcu_key); \
-})
-
 #define init_srcu_struct_fast(ssp) \
 ({ \
 	static struct lock_class_key __srcu_key; \
@@ -56,7 +55,12 @@ int __init_srcu_struct_fast_updown(struct srcu_struct *ssp, const char *name,
 #define __SRCU_DEP_MAP_INIT(srcu_name)	.dep_map = { .name = #srcu_name },
 #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
 
-int init_srcu_struct(struct srcu_struct *ssp);
+int init_srcu_struct_generic(struct srcu_struct *ssp);
+static inline int __init_srcu_struct(struct srcu_struct *ssp, const char *name,
+				     struct lock_class_key *key)
+{
+	return init_srcu_struct_generic(ssp);
+}
 #ifndef CONFIG_TINY_SRCU
 int init_srcu_struct_fast(struct srcu_struct *ssp);
 int init_srcu_struct_fast_updown(struct srcu_struct *ssp);
@@ -65,6 +69,13 @@ int init_srcu_struct_fast_updown(struct srcu_struct *ssp);
 #define __SRCU_DEP_MAP_INIT(srcu_name)
 #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
 
+#define init_srcu_struct(ssp) \
+({ \
+	static struct lock_class_key __srcu_key; \
+	\
+	__init_srcu_struct((ssp), #ssp, &__srcu_key); \
+})
+
 /* Values for SRCU Tree srcu_data ->srcu_reader_flavor, but also used by rcutorture. */
 #define SRCU_READ_FLAVOR_NORMAL		0x1		// srcu_read_lock().
 #define SRCU_READ_FLAVOR_NMI		0x2		// srcu_read_lock_nmisafe().