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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/include/linux/percpu-refcount.h
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@@ -75,27 +75,47 @@
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 	 * operation using percpu_ref_switch_to_percpu().  If initialized
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 	 * with this flag, the ref will stay in atomic mode until
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 	 * percpu_ref_switch_to_percpu() is invoked on it.
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+	 * Implies ALLOW_REINIT.
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 	 */
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 	PERCPU_REF_INIT_ATOMIC	= 1 << 0,
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 	/*
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 	 * Start dead w/ ref == 0 in atomic mode.  Must be revived with
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-	 * percpu_ref_reinit() before used.  Implies INIT_ATOMIC.
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+	 * percpu_ref_reinit() before used.  Implies INIT_ATOMIC and
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+	 * ALLOW_REINIT.
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 	 */
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 	PERCPU_REF_INIT_DEAD	= 1 << 1,
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+
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+	/*
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+	 * Allow switching from atomic mode to percpu mode.
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+	 */
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+	PERCPU_REF_ALLOW_REINIT	= 1 << 2,
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+};
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+
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+struct percpu_ref_data {
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+	atomic_long_t		count;
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+	percpu_ref_func_t	*release;
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+	percpu_ref_func_t	*confirm_switch;
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+	bool			force_atomic:1;
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+	bool			allow_reinit:1;
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+	struct rcu_head		rcu;
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+	struct percpu_ref	*ref;
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 };
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 struct percpu_ref {
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-	atomic_long_t		count;
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 	/*
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 	 * The low bit of the pointer indicates whether the ref is in percpu
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 	 * mode; if set, then get/put will manipulate the atomic_t.
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 	 */
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 	unsigned long		percpu_count_ptr;
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-	percpu_ref_func_t	*release;
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-	percpu_ref_func_t	*confirm_switch;
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-	bool			force_atomic:1;
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-	struct rcu_head		rcu;
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+
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+	/*
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+	 * 'percpu_ref' is often embedded into user structure, and only
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+	 * 'percpu_count_ptr' is required in fast path, move other fields
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+	 * into 'percpu_ref_data', so we can reduce memory footprint in
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+	 * fast path.
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+	 */
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+	struct percpu_ref_data  *data;
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 };
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 int __must_check percpu_ref_init(struct percpu_ref *ref,
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@@ -108,7 +128,9 @@
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 void percpu_ref_switch_to_percpu(struct percpu_ref *ref);
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 void percpu_ref_kill_and_confirm(struct percpu_ref *ref,
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 				 percpu_ref_func_t *confirm_kill);
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+void percpu_ref_resurrect(struct percpu_ref *ref);
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 void percpu_ref_reinit(struct percpu_ref *ref);
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+bool percpu_ref_is_zero(struct percpu_ref *ref);
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 /**
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  * percpu_ref_kill - drop the initial ref
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@@ -146,7 +168,7 @@
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 	 * between contaminating the pointer value, meaning that
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 	 * READ_ONCE() is required when fetching it.
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 	 *
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-	 * The smp_read_barrier_depends() implied by READ_ONCE() pairs
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+	 * The dependency ordering from the READ_ONCE() pairs
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 	 * with smp_store_release() in __percpu_ref_switch_to_percpu().
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 	 */
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 	percpu_ptr = READ_ONCE(ref->percpu_count_ptr);
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@@ -177,14 +199,14 @@
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 {
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 	unsigned long __percpu *percpu_count;
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-	rcu_read_lock_sched();
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+	rcu_read_lock();
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 	if (__ref_is_percpu(ref, &percpu_count))
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 		this_cpu_add(*percpu_count, nr);
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 	else
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-		atomic_long_add(nr, &ref->count);
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+		atomic_long_add(nr, &ref->data->count);
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-	rcu_read_unlock_sched();
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+	rcu_read_unlock();
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 }
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 /**
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@@ -201,6 +223,36 @@
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 }
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 /**
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+ * percpu_ref_tryget_many - try to increment a percpu refcount
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+ * @ref: percpu_ref to try-get
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+ * @nr: number of references to get
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+ *
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+ * Increment a percpu refcount  by @nr unless its count already reached zero.
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+ * Returns %true on success; %false on failure.
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+ *
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+ * This function is safe to call as long as @ref is between init and exit.
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+ */
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+static inline bool percpu_ref_tryget_many(struct percpu_ref *ref,
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+					  unsigned long nr)
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+{
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+	unsigned long __percpu *percpu_count;
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+	bool ret;
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+
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+	rcu_read_lock();
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+
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+	if (__ref_is_percpu(ref, &percpu_count)) {
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+		this_cpu_add(*percpu_count, nr);
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+		ret = true;
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+	} else {
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+		ret = atomic_long_add_unless(&ref->data->count, nr, 0);
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+	}
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+
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+	rcu_read_unlock();
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+
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+	return ret;
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+}
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+
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+/**
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  * percpu_ref_tryget - try to increment a percpu refcount
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  * @ref: percpu_ref to try-get
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  *
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@@ -211,21 +263,7 @@
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  */
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 static inline bool percpu_ref_tryget(struct percpu_ref *ref)
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 {
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-	unsigned long __percpu *percpu_count;
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-	bool ret;
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-
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-	rcu_read_lock_sched();
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-
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-	if (__ref_is_percpu(ref, &percpu_count)) {
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-		this_cpu_inc(*percpu_count);
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-		ret = true;
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-	} else {
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-		ret = atomic_long_inc_not_zero(&ref->count);
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-	}
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-
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-	rcu_read_unlock_sched();
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-
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-	return ret;
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+	return percpu_ref_tryget_many(ref, 1);
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 }
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 /**
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@@ -248,16 +286,16 @@
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 	unsigned long __percpu *percpu_count;
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 	bool ret = false;
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-	rcu_read_lock_sched();
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+	rcu_read_lock();
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 	if (__ref_is_percpu(ref, &percpu_count)) {
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 		this_cpu_inc(*percpu_count);
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 		ret = true;
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 	} else if (!(ref->percpu_count_ptr & __PERCPU_REF_DEAD)) {
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-		ret = atomic_long_inc_not_zero(&ref->count);
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+		ret = atomic_long_inc_not_zero(&ref->data->count);
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 	}
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-	rcu_read_unlock_sched();
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+	rcu_read_unlock();
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 	return ret;
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 }
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@@ -276,14 +314,14 @@
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 {
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 	unsigned long __percpu *percpu_count;
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-	rcu_read_lock_sched();
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+	rcu_read_lock();
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 	if (__ref_is_percpu(ref, &percpu_count))
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 		this_cpu_sub(*percpu_count, nr);
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-	else if (unlikely(atomic_long_sub_and_test(nr, &ref->count)))
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-		ref->release(ref);
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+	else if (unlikely(atomic_long_sub_and_test(nr, &ref->data->count)))
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+		ref->data->release(ref);
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-	rcu_read_unlock_sched();
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+	rcu_read_unlock();
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 }
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 /**
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@@ -312,23 +350,6 @@
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 static inline bool percpu_ref_is_dying(struct percpu_ref *ref)
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 {
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 	return ref->percpu_count_ptr & __PERCPU_REF_DEAD;
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-}
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-
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-/**
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- * percpu_ref_is_zero - test whether a percpu refcount reached zero
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- * @ref: percpu_ref to test
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- *
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- * Returns %true if @ref reached zero.
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- *
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- * This function is safe to call as long as @ref is between init and exit.
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- */
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-static inline bool percpu_ref_is_zero(struct percpu_ref *ref)
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-{
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-	unsigned long __percpu *percpu_count;
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-
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-	if (__ref_is_percpu(ref, &percpu_count))
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-		return false;
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-	return !atomic_long_read(&ref->count);
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 }
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 #endif