Merge branch 'slab/for-6.15/kfree_rcu_tiny' into slab/for-next

Merge the slab feature branch kfree_rcu_tiny for 6.15:

- Move the TINY_RCU kvfree_rcu() implementation from RCU to SLAB
  subsystem and cleanup its integration.

2 files changed, 2 insertions, 32 deletions

diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c
index 4b3f31911465..7a34a99d4664 100644
--- a/kernel/rcu/tiny.c
+++ b/kernel/rcu/tiny.c
@@ -85,15 +85,8 @@ void rcu_sched_clock_irq(int user)
 static inline bool rcu_reclaim_tiny(struct rcu_head *head)
 {
 	rcu_callback_t f;
-	unsigned long offset = (unsigned long)head->func;
 
 	rcu_lock_acquire(&rcu_callback_map);
-	if (__is_kvfree_rcu_offset(offset)) {
-		trace_rcu_invoke_kvfree_callback("", head, offset);
-		kvfree((void *)head - offset);
-		rcu_lock_release(&rcu_callback_map);
-		return true;
-	}
 
 	trace_rcu_invoke_callback("", head);
 	f = head->func;
@@ -159,10 +152,6 @@ void synchronize_rcu(void)
 }
 EXPORT_SYMBOL_GPL(synchronize_rcu);
 
-static void tiny_rcu_leak_callback(struct rcu_head *rhp)
-{
-}
-
 /*
  * Post an RCU callback to be invoked after the end of an RCU grace
  * period.  But since we have but one CPU, that would be after any
@@ -178,9 +167,6 @@ void call_rcu(struct rcu_head *head, rcu_callback_t func)
 			pr_err("%s(): Double-freed CB %p->%pS()!!!  ", __func__, head, head->func);
 			mem_dump_obj(head);
 		}
-
-		if (!__is_kvfree_rcu_offset((unsigned long)head->func))
-			WRITE_ONCE(head->func, tiny_rcu_leak_callback);
 		return;
 	}
 
@@ -246,17 +232,6 @@ bool poll_state_synchronize_rcu(unsigned long oldstate)
 }
 EXPORT_SYMBOL_GPL(poll_state_synchronize_rcu);
 
-#ifdef CONFIG_KASAN_GENERIC
-void kvfree_call_rcu(struct rcu_head *head, void *ptr)
-{
-	if (head)
-		kasan_record_aux_stack(ptr);
-
-	__kvfree_call_rcu(head, ptr);
-}
-EXPORT_SYMBOL_GPL(kvfree_call_rcu);
-#endif
-
 void __init rcu_init(void)
 {
 	open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 475f31deed14..5dbc4189037c 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2931,13 +2931,8 @@ static int __init rcu_spawn_core_kthreads(void)
 static void rcutree_enqueue(struct rcu_data *rdp, struct rcu_head *head, rcu_callback_t func)
 {
 	rcu_segcblist_enqueue(&rdp->cblist, head);
-	if (__is_kvfree_rcu_offset((unsigned long)func))
-		trace_rcu_kvfree_callback(rcu_state.name, head,
-					 (unsigned long)func,
-					 rcu_segcblist_n_cbs(&rdp->cblist));
-	else
-		trace_rcu_callback(rcu_state.name, head,
-				   rcu_segcblist_n_cbs(&rdp->cblist));
+	trace_rcu_callback(rcu_state.name, head,
+			   rcu_segcblist_n_cbs(&rdp->cblist));
 	trace_rcu_segcb_stats(&rdp->cblist, TPS("SegCBQueued"));
 }