Merge tag 'rcu-fixes.v7.0-20260325a' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux

Pull RCU fixes from Boqun Feng:
 "Fix a regression introduced by commit c27cea4416a3 ("rcu: Re-implement
  RCU Tasks Trace in terms of SRCU-fast"): BPF contexts can run with
  preemption disabled or scheduler locks held, so call_srcu() must work
  in all such contexts.

  Fix this by converting SRCU's spinlocks to raw spinlocks and avoiding
  scheduler lock acquisition in call_srcu() by deferring to an irq_work
  (similar to call_rcu_tasks_generic()), for both tree SRCU and tiny
  SRCU.

  Also fix a follow-on lockdep splat caused by srcu_node allocation
  under the newly introduced raw spinlock by deferring the allocation to
  grace-period worker context"

* tag 'rcu-fixes.v7.0-20260325a' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux:
  srcu: Use irq_work to start GP in tiny SRCU
  rcu: Use an intermediate irq_work to start process_srcu()
  srcu: Push srcu_node allocation to GP when non-preemptible
  srcu: Use raw spinlocks so call_srcu() can be used under preempt_disable()

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/srcutiny.h b/include/linux/srcutiny.h
index dec7cbe015aa..905b629e8fa3 100644
--- a/include/linux/srcutiny.h
+++ b/include/linux/srcutiny.h
@@ -11,6 +11,7 @@
 #ifndef _LINUX_SRCU_TINY_H
 #define _LINUX_SRCU_TINY_H
 
+#include <linux/irq_work_types.h>
 #include <linux/swait.h>
 
 struct srcu_struct {
@@ -24,18 +25,21 @@ struct srcu_struct {
 	struct rcu_head *srcu_cb_head;	/* Pending callbacks: Head. */
 	struct rcu_head **srcu_cb_tail;	/* Pending callbacks: Tail. */
 	struct work_struct srcu_work;	/* For driving grace periods. */
+	struct irq_work srcu_irq_work;	/* Defer schedule_work() to irq work. */
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 	struct lockdep_map dep_map;
 #endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
 };
 
 void srcu_drive_gp(struct work_struct *wp);
+void srcu_tiny_irq_work(struct irq_work *irq_work);
 
 #define __SRCU_STRUCT_INIT(name, __ignored, ___ignored, ____ignored)	\
 {									\
 	.srcu_wq = __SWAIT_QUEUE_HEAD_INITIALIZER(name.srcu_wq),	\
 	.srcu_cb_tail = &name.srcu_cb_head,				\
 	.srcu_work = __WORK_INITIALIZER(name.srcu_work, srcu_drive_gp),	\
+	.srcu_irq_work = { .func = srcu_tiny_irq_work },		\
 	__SRCU_DEP_MAP_INIT(name)					\
 }