Merge branch 'driver-core/driver-core-next'

Pull in dependent cgroup patches
Signed-off-by: Peter Zijlstra <peterz@infradead.org>

Documentation/driver-api/driver-model/devres.rst

@@ -310,7 +310,6 @@ IOMAP
   devm_ioremap()
   devm_ioremap_uc()
   devm_ioremap_wc()
-  devm_ioremap_np()
   devm_ioremap_resource() : checks resource, requests memory region, ioremaps
   devm_ioremap_resource_wc()
   devm_platform_ioremap_resource() : calls devm_ioremap_resource() for platform device

drivers/base/class.c

@@ -260,7 +260,7 @@ EXPORT_SYMBOL_GPL(__class_create);
  */
 void class_destroy(struct class *cls)
 {
-	if ((cls == NULL) || (IS_ERR(cls)))
+	if (IS_ERR_OR_NULL(cls))
 		return;
 
 	class_unregister(cls);

drivers/base/core.c

@@ -2509,7 +2509,7 @@ static ssize_t uevent_store(struct device *dev, struct device_attribute *attr,
 	rc = kobject_synth_uevent(&dev->kobj, buf, count);
 
 	if (rc) {
-		dev_err(dev, "uevent: failed to send synthetic uevent\n");
+		dev_err(dev, "uevent: failed to send synthetic uevent: %d\n", rc);
 		return rc;
 	}
 

drivers/base/dd.c

@@ -836,7 +836,7 @@ static int __init save_async_options(char *buf)
 	if (strlen(buf) >= ASYNC_DRV_NAMES_MAX_LEN)
 		pr_warn("Too long list of driver names for 'driver_async_probe'!\n");
 
-	strlcpy(async_probe_drv_names, buf, ASYNC_DRV_NAMES_MAX_LEN);
+	strscpy(async_probe_drv_names, buf, ASYNC_DRV_NAMES_MAX_LEN);
 	async_probe_default = parse_option_str(async_probe_drv_names, "*");
 
 	return 1;

drivers/base/devres.c

@@ -117,7 +117,9 @@ static __always_inline struct devres * alloc_dr(dr_release_t release,
 	if (unlikely(!dr))
 		return NULL;
 
-	memset(dr, 0, offsetof(struct devres, data));
+	/* No need to clear memory twice */
+	if (!(gfp & __GFP_ZERO))
+		memset(dr, 0, offsetof(struct devres, data));
 
 	INIT_LIST_HEAD(&dr->node.entry);
 	dr->node.release = release;

fs/kernfs/dir.c

@@ -472,6 +472,16 @@ static void kernfs_drain(struct kernfs_node *kn)
 	lockdep_assert_held_write(&root->kernfs_rwsem);
 	WARN_ON_ONCE(kernfs_active(kn));
 
+	/*
+	 * Skip draining if already fully drained. This avoids draining and its
+	 * lockdep annotations for nodes which have never been activated
+	 * allowing embedding kernfs_remove() in create error paths without
+	 * worrying about draining.
+	 */
+	if (atomic_read(&kn->active) == KN_DEACTIVATED_BIAS &&
+	    !kernfs_should_drain_open_files(kn))
+		return;
+
 	up_write(&root->kernfs_rwsem);
 
 	if (kernfs_lockdep(kn)) {
@@ -480,7 +490,6 @@ static void kernfs_drain(struct kernfs_node *kn)
 			lock_contended(&kn->dep_map, _RET_IP_);
 	}
 
-	/* but everyone should wait for draining */
 	wait_event(root->deactivate_waitq,
 		   atomic_read(&kn->active) == KN_DEACTIVATED_BIAS);
 
@@ -489,7 +498,8 @@ static void kernfs_drain(struct kernfs_node *kn)
 		rwsem_release(&kn->dep_map, _RET_IP_);
 	}
 
-	kernfs_drain_open_files(kn);
+	if (kernfs_should_drain_open_files(kn))
+		kernfs_drain_open_files(kn);
 
 	down_write(&root->kernfs_rwsem);
 }
@@ -695,13 +705,7 @@ struct kernfs_node *kernfs_find_and_get_node_by_id(struct kernfs_root *root,
 			goto err_unlock;
 	}
 
-	/*
-	 * ACTIVATED is protected with kernfs_mutex but it was clear when
-	 * @kn was added to idr and we just wanna see it set.  No need to
-	 * grab kernfs_mutex.
-	 */
-	if (unlikely(!(kn->flags & KERNFS_ACTIVATED) ||
-		     !atomic_inc_not_zero(&kn->count)))
+	if (unlikely(!kernfs_active(kn) || !atomic_inc_not_zero(&kn->count)))
 		goto err_unlock;
 
 	spin_unlock(&kernfs_idr_lock);
@@ -743,10 +747,7 @@ int kernfs_add_one(struct kernfs_node *kn)
 		goto out_unlock;
 
 	ret = -ENOENT;
-	if (parent->flags & KERNFS_EMPTY_DIR)
-		goto out_unlock;
-
-	if ((parent->flags & KERNFS_ACTIVATED) && !kernfs_active(parent))
+	if (parent->flags & (KERNFS_REMOVING | KERNFS_EMPTY_DIR))
 		goto out_unlock;
 
 	kn->hash = kernfs_name_hash(kn->name, kn->ns);
@@ -1304,6 +1305,21 @@ static struct kernfs_node *kernfs_next_descendant_post(struct kernfs_node *pos,
 	return pos->parent;
 }
 
+static void kernfs_activate_one(struct kernfs_node *kn)
+{
+	lockdep_assert_held_write(&kernfs_root(kn)->kernfs_rwsem);
+
+	kn->flags |= KERNFS_ACTIVATED;
+
+	if (kernfs_active(kn) || (kn->flags & (KERNFS_HIDDEN | KERNFS_REMOVING)))
+		return;
+
+	WARN_ON_ONCE(kn->parent && RB_EMPTY_NODE(&kn->rb));
+	WARN_ON_ONCE(atomic_read(&kn->active) != KN_DEACTIVATED_BIAS);
+
+	atomic_sub(KN_DEACTIVATED_BIAS, &kn->active);
+}
+
 /**
  * kernfs_activate - activate a node which started deactivated
  * @kn: kernfs_node whose subtree is to be activated
@@ -1325,15 +1341,42 @@ void kernfs_activate(struct kernfs_node *kn)
 	down_write(&root->kernfs_rwsem);
 
 	pos = NULL;
-	while ((pos = kernfs_next_descendant_post(pos, kn))) {
-		if (pos->flags & KERNFS_ACTIVATED)
-			continue;
+	while ((pos = kernfs_next_descendant_post(pos, kn)))
+		kernfs_activate_one(pos);
+
+	up_write(&root->kernfs_rwsem);
+}
 
-		WARN_ON_ONCE(pos->parent && RB_EMPTY_NODE(&pos->rb));
-		WARN_ON_ONCE(atomic_read(&pos->active) != KN_DEACTIVATED_BIAS);
+/**
+ * kernfs_show - show or hide a node
+ * @kn: kernfs_node to show or hide
+ * @show: whether to show or hide
+ *
+ * If @show is %false, @kn is marked hidden and deactivated. A hidden node is
+ * ignored in future activaitons. If %true, the mark is removed and activation
+ * state is restored. This function won't implicitly activate a new node in a
+ * %KERNFS_ROOT_CREATE_DEACTIVATED root which hasn't been activated yet.
+ *
+ * To avoid recursion complexities, directories aren't supported for now.
+ */
+void kernfs_show(struct kernfs_node *kn, bool show)
+{
+	struct kernfs_root *root = kernfs_root(kn);
 
-		atomic_sub(KN_DEACTIVATED_BIAS, &pos->active);
-		pos->flags |= KERNFS_ACTIVATED;
+	if (WARN_ON_ONCE(kernfs_type(kn) == KERNFS_DIR))
+		return;
+
+	down_write(&root->kernfs_rwsem);
+
+	if (show) {
+		kn->flags &= ~KERNFS_HIDDEN;
+		if (kn->flags & KERNFS_ACTIVATED)
+			kernfs_activate_one(kn);
+	} else {
+		kn->flags |= KERNFS_HIDDEN;
+		if (kernfs_active(kn))
+			atomic_add(KN_DEACTIVATED_BIAS, &kn->active);
+		kernfs_drain(kn);
 	}
 
 	up_write(&root->kernfs_rwsem);
@@ -1358,34 +1401,27 @@ static void __kernfs_remove(struct kernfs_node *kn)
 
 	pr_debug("kernfs %s: removing\n", kn->name);
 
-	/* prevent any new usage under @kn by deactivating all nodes */
+	/* prevent new usage by marking all nodes removing and deactivating */
 	pos = NULL;
-	while ((pos = kernfs_next_descendant_post(pos, kn)))
+	while ((pos = kernfs_next_descendant_post(pos, kn))) {
+		pos->flags |= KERNFS_REMOVING;
 		if (kernfs_active(pos))
 			atomic_add(KN_DEACTIVATED_BIAS, &pos->active);
+	}
 
 	/* deactivate and unlink the subtree node-by-node */
 	do {
 		pos = kernfs_leftmost_descendant(kn);
 
 		/*
-		 * kernfs_drain() drops kernfs_rwsem temporarily and @pos's
+		 * kernfs_drain() may drop kernfs_rwsem temporarily and @pos's
 		 * base ref could have been put by someone else by the time
 		 * the function returns.  Make sure it doesn't go away
 		 * underneath us.
 		 */
 		kernfs_get(pos);
 
-		/*
-		 * Drain iff @kn was activated.  This avoids draining and
-		 * its lockdep annotations for nodes which have never been
-		 * activated and allows embedding kernfs_remove() in create
-		 * error paths without worrying about draining.
-		 */
-		if (kn->flags & KERNFS_ACTIVATED)
-			kernfs_drain(pos);
-		else
-			WARN_ON_ONCE(atomic_read(&kn->active) != KN_DEACTIVATED_BIAS);
+		kernfs_drain(pos);
 
 		/*
 		 * kernfs_unlink_sibling() succeeds once per node.  Use it

fs/kernfs/file.c

@@ -23,6 +23,8 @@ struct kernfs_open_node {
 	atomic_t		event;
 	wait_queue_head_t	poll;
 	struct list_head	files; /* goes through kernfs_open_file.list */
+	unsigned int		nr_mmapped;
+	unsigned int		nr_to_release;
 };
 
 /*
@@ -57,31 +59,17 @@ static inline struct mutex *kernfs_open_file_mutex_lock(struct kernfs_node *kn)
 }
 
 /**
- * kernfs_deref_open_node - Get kernfs_open_node corresponding to @kn.
- *
- * @of: associated kernfs_open_file instance.
- * @kn: target kernfs_node.
- *
- * Fetch and return ->attr.open of @kn if @of->list is non empty.
- * If @of->list is not empty we can safely assume that @of is on
- * @kn->attr.open->files list and this guarantees that @kn->attr.open
- * will not vanish i.e. dereferencing outside RCU read-side critical
- * section is safe here.
- *
- * The caller needs to make sure that @of->list is not empty.
+ * of_on - Return the kernfs_open_node of the specified kernfs_open_file
+ * @of: taret kernfs_open_file
  */
-static struct kernfs_open_node *
-kernfs_deref_open_node(struct kernfs_open_file *of, struct kernfs_node *kn)
+static struct kernfs_open_node *of_on(struct kernfs_open_file *of)
 {
-	struct kernfs_open_node *on;
-
-	on = rcu_dereference_check(kn->attr.open, !list_empty(&of->list));
-
-	return on;
+	return rcu_dereference_protected(of->kn->attr.open,
+					 !list_empty(&of->list));
 }
 
 /**
- * kernfs_deref_open_node_protected - Get kernfs_open_node corresponding to @kn
+ * kernfs_deref_open_node_locked - Get kernfs_open_node corresponding to @kn
  *
  * @kn: target kernfs_node.
  *
@@ -96,7 +84,7 @@ kernfs_deref_open_node(struct kernfs_open_file *of, struct kernfs_node *kn)
  * The caller needs to make sure that kernfs_open_file_mutex is held.
  */
 static struct kernfs_open_node *
-kernfs_deref_open_node_protected(struct kernfs_node *kn)
+kernfs_deref_open_node_locked(struct kernfs_node *kn)
 {
 	return rcu_dereference_protected(kn->attr.open,
 				lockdep_is_held(kernfs_open_file_mutex_ptr(kn)));
@@ -207,12 +195,8 @@ static void kernfs_seq_stop(struct seq_file *sf, void *v)
 static int kernfs_seq_show(struct seq_file *sf, void *v)
 {
 	struct kernfs_open_file *of = sf->private;
-	struct kernfs_open_node *on = kernfs_deref_open_node(of, of->kn);
-
-	if (!on)
-		return -EINVAL;
 
-	of->event = atomic_read(&on->event);
+	of->event = atomic_read(&of_on(of)->event);
 
 	return of->kn->attr.ops->seq_show(sf, v);
 }
@@ -235,7 +219,6 @@ static ssize_t kernfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 	struct kernfs_open_file *of = kernfs_of(iocb->ki_filp);
 	ssize_t len = min_t(size_t, iov_iter_count(iter), PAGE_SIZE);
 	const struct kernfs_ops *ops;
-	struct kernfs_open_node *on;
 	char *buf;
 
 	buf = of->prealloc_buf;
@@ -257,14 +240,7 @@ static ssize_t kernfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 		goto out_free;
 	}
 
-	on = kernfs_deref_open_node(of, of->kn);
-	if (!on) {
-		len = -EINVAL;
-		mutex_unlock(&of->mutex);
-		goto out_free;
-	}
-
-	of->event = atomic_read(&on->event);
+	of->event = atomic_read(&of_on(of)->event);
 
 	ops = kernfs_ops(of->kn);
 	if (ops->read)
@@ -553,6 +529,7 @@ static int kernfs_fop_mmap(struct file *file, struct vm_area_struct *vma)
 
 	rc = 0;
 	of->mmapped = true;
+	of_on(of)->nr_mmapped++;
 	of->vm_ops = vma->vm_ops;
 	vma->vm_ops = &kernfs_vm_ops;
 out_put:
@@ -580,31 +557,30 @@ static int kernfs_fop_mmap(struct file *file, struct vm_area_struct *vma)
 static int kernfs_get_open_node(struct kernfs_node *kn,
 				struct kernfs_open_file *of)
 {
-	struct kernfs_open_node *on, *new_on = NULL;
-	struct mutex *mutex = NULL;
+	struct kernfs_open_node *on;
+	struct mutex *mutex;
 
 	mutex = kernfs_open_file_mutex_lock(kn);
-	on = kernfs_deref_open_node_protected(kn);
+	on = kernfs_deref_open_node_locked(kn);
 
-	if (on) {
-		list_add_tail(&of->list, &on->files);
-		mutex_unlock(mutex);
-		return 0;
-	} else {
+	if (!on) {
 		/* not there, initialize a new one */
-		new_on = kmalloc(sizeof(*new_on), GFP_KERNEL);
-		if (!new_on) {
+		on = kzalloc(sizeof(*on), GFP_KERNEL);
+		if (!on) {
 			mutex_unlock(mutex);
 			return -ENOMEM;
 		}
-		atomic_set(&new_on->event, 1);
-		init_waitqueue_head(&new_on->poll);
-		INIT_LIST_HEAD(&new_on->files);
-		list_add_tail(&of->list, &new_on->files);
-		rcu_assign_pointer(kn->attr.open, new_on);
+		atomic_set(&on->event, 1);
+		init_waitqueue_head(&on->poll);
+		INIT_LIST_HEAD(&on->files);
+		rcu_assign_pointer(kn->attr.open, on);
 	}
-	mutex_unlock(mutex);
 
+	list_add_tail(&of->list, &on->files);
+	if (kn->flags & KERNFS_HAS_RELEASE)
+		on->nr_to_release++;
+
+	mutex_unlock(mutex);
 	return 0;
 }
 
@@ -613,6 +589,7 @@ static int kernfs_get_open_node(struct kernfs_node *kn,
  *
  *	@kn: target kernfs_node
  *	@of: associated kernfs_open_file
+ *	@open_failed: ->open() failed, cancel ->release()
  *
  *	Unlink @of from list of @kn's associated open files. If list of
  *	associated open files becomes empty, disassociate and free
@@ -622,21 +599,30 @@ static int kernfs_get_open_node(struct kernfs_node *kn,
  *	None.
  */
 static void kernfs_unlink_open_file(struct kernfs_node *kn,
-				 struct kernfs_open_file *of)
+				    struct kernfs_open_file *of,
+				    bool open_failed)
 {
 	struct kernfs_open_node *on;
-	struct mutex *mutex = NULL;
+	struct mutex *mutex;
 
 	mutex = kernfs_open_file_mutex_lock(kn);
 
-	on = kernfs_deref_open_node_protected(kn);
+	on = kernfs_deref_open_node_locked(kn);
 	if (!on) {
 		mutex_unlock(mutex);
 		return;
 	}
 
-	if (of)
+	if (of) {
+		if (kn->flags & KERNFS_HAS_RELEASE) {
+			WARN_ON_ONCE(of->released == open_failed);
+			if (open_failed)
+				on->nr_to_release--;
+		}
+		if (of->mmapped)
+			on->nr_mmapped--;
 		list_del(&of->list);
+	}
 
 	if (list_empty(&on->files)) {
 		rcu_assign_pointer(kn->attr.open, NULL);
@@ -763,7 +749,7 @@ static int kernfs_fop_open(struct inode *inode, struct file *file)
 	return 0;
 
 err_put_node:
-	kernfs_unlink_open_file(kn, of);
+	kernfs_unlink_open_file(kn, of, true);
 err_seq_release:
 	seq_release(inode, file);
 err_free:
@@ -795,6 +781,7 @@ static void kernfs_release_file(struct kernfs_node *kn,
 		 */
 		kn->attr.ops->release(of);
 		of->released = true;
+		of_on(of)->nr_to_release--;
 	}
 }
 
@@ -802,15 +789,16 @@ static int kernfs_fop_release(struct inode *inode, struct file *filp)
 {
 	struct kernfs_node *kn = inode->i_private;
 	struct kernfs_open_file *of = kernfs_of(filp);
-	struct mutex *mutex = NULL;
 
 	if (kn->flags & KERNFS_HAS_RELEASE) {
+		struct mutex *mutex;
+
 		mutex = kernfs_open_file_mutex_lock(kn);
 		kernfs_release_file(kn, of);
 		mutex_unlock(mutex);
 	}
 
-	kernfs_unlink_open_file(kn, of);
+	kernfs_unlink_open_file(kn, of, false);
 	seq_release(inode, filp);
 	kfree(of->prealloc_buf);
 	kfree(of);
@@ -818,28 +806,33 @@ static int kernfs_fop_release(struct inode *inode, struct file *filp)
 	return 0;
 }
 
-void kernfs_drain_open_files(struct kernfs_node *kn)
+bool kernfs_should_drain_open_files(struct kernfs_node *kn)
 {
 	struct kernfs_open_node *on;
-	struct kernfs_open_file *of;
-	struct mutex *mutex = NULL;
-
-	if (!(kn->flags & (KERNFS_HAS_MMAP | KERNFS_HAS_RELEASE)))
-		return;
+	bool ret;
 
 	/*
-	 * lockless opportunistic check is safe below because no one is adding to
-	 * ->attr.open at this point of time. This check allows early bail out
-	 * if ->attr.open is already NULL. kernfs_unlink_open_file makes
-	 * ->attr.open NULL only while holding kernfs_open_file_mutex so below
-	 * check under kernfs_open_file_mutex_ptr(kn) will ensure bailing out if
-	 * ->attr.open became NULL while waiting for the mutex.
+	 * @kn being deactivated guarantees that @kn->attr.open can't change
+	 * beneath us making the lockless test below safe.
 	 */
-	if (!rcu_access_pointer(kn->attr.open))
-		return;
+	WARN_ON_ONCE(atomic_read(&kn->active) != KN_DEACTIVATED_BIAS);
+
+	rcu_read_lock();
+	on = rcu_dereference(kn->attr.open);
+	ret = on && (on->nr_mmapped || on->nr_to_release);
+	rcu_read_unlock();
+
+	return ret;
+}
+
+void kernfs_drain_open_files(struct kernfs_node *kn)
+{
+	struct kernfs_open_node *on;
+	struct kernfs_open_file *of;
+	struct mutex *mutex;
 
 	mutex = kernfs_open_file_mutex_lock(kn);
-	on = kernfs_deref_open_node_protected(kn);
+	on = kernfs_deref_open_node_locked(kn);
 	if (!on) {
 		mutex_unlock(mutex);
 		return;
@@ -848,13 +841,17 @@ void kernfs_drain_open_files(struct kernfs_node *kn)
 	list_for_each_entry(of, &on->files, list) {
 		struct inode *inode = file_inode(of->file);
 
-		if (kn->flags & KERNFS_HAS_MMAP)
+		if (of->mmapped) {
 			unmap_mapping_range(inode->i_mapping, 0, 0, 1);
+			of->mmapped = false;
+			on->nr_mmapped--;
+		}
 
 		if (kn->flags & KERNFS_HAS_RELEASE)
 			kernfs_release_file(kn, of);
 	}
 
+	WARN_ON_ONCE(on->nr_mmapped || on->nr_to_release);
 	mutex_unlock(mutex);
 }
 
@@ -874,11 +871,7 @@ void kernfs_drain_open_files(struct kernfs_node *kn)
  */
 __poll_t kernfs_generic_poll(struct kernfs_open_file *of, poll_table *wait)
 {
-	struct kernfs_node *kn = kernfs_dentry_node(of->file->f_path.dentry);
-	struct kernfs_open_node *on = kernfs_deref_open_node(of, kn);
-
-	if (!on)
-		return EPOLLERR;
+	struct kernfs_open_node *on = of_on(of);
 
 	poll_wait(of->file, &on->poll, wait);
 

fs/kernfs/kernfs-internal.h

@@ -157,6 +157,7 @@ struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
  */
 extern const struct file_operations kernfs_file_fops;
 
+bool kernfs_should_drain_open_files(struct kernfs_node *kn);
 void kernfs_drain_open_files(struct kernfs_node *kn);
 
 /*

include/linux/cgroup.h

@@ -114,6 +114,7 @@ int cgroup_add_dfl_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
 int cgroup_add_legacy_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
 int cgroup_rm_cftypes(struct cftype *cfts);
 void cgroup_file_notify(struct cgroup_file *cfile);
+void cgroup_file_show(struct cgroup_file *cfile, bool show);
 
 int task_cgroup_path(struct task_struct *task, char *buf, size_t buflen);
 int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry);

include/linux/io.h

@@ -59,8 +59,6 @@ void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset,
 				   resource_size_t size);
 void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
 				   resource_size_t size);
-void __iomem *devm_ioremap_np(struct device *dev, resource_size_t offset,
-				   resource_size_t size);
 void devm_iounmap(struct device *dev, void __iomem *addr);
 int check_signature(const volatile void __iomem *io_addr,
 			const unsigned char *signature, int length);

include/linux/kernfs.h

@@ -108,10 +108,12 @@ enum kernfs_node_flag {
 	KERNFS_HAS_SEQ_SHOW	= 0x0040,
 	KERNFS_HAS_MMAP		= 0x0080,
 	KERNFS_LOCKDEP		= 0x0100,
+	KERNFS_HIDDEN		= 0x0200,
 	KERNFS_SUICIDAL		= 0x0400,
 	KERNFS_SUICIDED		= 0x0800,
 	KERNFS_EMPTY_DIR	= 0x1000,
 	KERNFS_HAS_RELEASE	= 0x2000,
+	KERNFS_REMOVING		= 0x4000,
 };
 
 /* @flags for kernfs_create_root() */
@@ -429,6 +431,7 @@ struct kernfs_node *kernfs_create_link(struct kernfs_node *parent,
 				       const char *name,
 				       struct kernfs_node *target);
 void kernfs_activate(struct kernfs_node *kn);
+void kernfs_show(struct kernfs_node *kn, bool show);
 void kernfs_remove(struct kernfs_node *kn);
 void kernfs_break_active_protection(struct kernfs_node *kn);
 void kernfs_unbreak_active_protection(struct kernfs_node *kn);

kernel/cgroup/cgroup.c

@@ -4371,6 +4371,26 @@ void cgroup_file_notify(struct cgroup_file *cfile)
 	spin_unlock_irqrestore(&cgroup_file_kn_lock, flags);
 }
 
+/**
+ * cgroup_file_show - show or hide a hidden cgroup file
+ * @cfile: target cgroup_file obtained by setting cftype->file_offset
+ * @show: whether to show or hide
+ */
+void cgroup_file_show(struct cgroup_file *cfile, bool show)
+{
+	struct kernfs_node *kn;
+
+	spin_lock_irq(&cgroup_file_kn_lock);
+	kn = cfile->kn;
+	kernfs_get(kn);
+	spin_unlock_irq(&cgroup_file_kn_lock);
+
+	if (kn)
+		kernfs_show(kn, show);
+
+	kernfs_put(kn);
+}
+
 /**
  * css_next_child - find the next child of a given css
  * @pos: the current position (%NULL to initiate traversal)

lib/devres.c

@@ -103,21 +103,6 @@ void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
 }
 EXPORT_SYMBOL(devm_ioremap_wc);
 
-/**
- * devm_ioremap_np - Managed ioremap_np()
- * @dev: Generic device to remap IO address for
- * @offset: Resource address to map
- * @size: Size of map
- *
- * Managed ioremap_np().  Map is automatically unmapped on driver detach.
- */
-void __iomem *devm_ioremap_np(struct device *dev, resource_size_t offset,
-			      resource_size_t size)
-{
-	return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_NP);
-}
-EXPORT_SYMBOL(devm_ioremap_np);
-
 /**
  * devm_iounmap - Managed iounmap()
  * @dev: Generic device to unmap for