linux-kernel - [PATCH] headers/uninline: Uninline single-use function: kobject_has

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Date:   Tue, 4 Jan 2022 14:54:31 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "Kirill A. Shutemov" <kirill@...temov.name>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Ard Biesheuvel <ardb@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH] headers/uninline: Uninline single-use function:
 kobject_has_children()


* Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:

> On Tue, Jan 04, 2022 at 11:54:55AM +0100, Ingo Molnar wrote:
> > There's one happy exception though, all the uninlining patches that 
> > uninline a single-call function are probably fine as-is:
> 
> <snip>
> 
> >  3443e75fd1f8 headers/uninline: Uninline single-use function: kobject_has_children()
> 
> Let me go take this right now, no need for this to wait, it should be
> out of kobject.h as you rightfully show there is only one user.

Sure - here you go!

Thanks,

	Ingo


=============================>
From: Ingo Molnar <mingo@...nel.org>
Date: Sun, 29 Aug 2021 09:18:53 +0200
Subject: [PATCH] headers/uninline: Uninline single-use function: kobject_has_children()

This was the only usage of <linux/kref_api.h> in <linux/kobject_api.h>,
so we'll able to decouple the two after this change.

Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 drivers/base/core.c     | 17 +++++++++++++++++
 include/linux/kobject.h | 17 -----------------
 2 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index fd034d742447..e1f2a5791c0e 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -3029,6 +3029,23 @@ static inline struct kobject *get_glue_dir(struct device *dev)
 	return dev->kobj.parent;
 }
 
+/**
+ * kobject_has_children - Returns whether a kobject has children.
+ * @kobj: the object to test
+ *
+ * This will return whether a kobject has other kobjects as children.
+ *
+ * It does NOT account for the presence of attribute files, only sub
+ * directories. It also assumes there is no concurrent addition or
+ * removal of such children, and thus relies on external locking.
+ */
+static inline bool kobject_has_children(struct kobject *kobj)
+{
+	WARN_ON_ONCE(kref_read(&kobj->kref) == 0);
+
+	return kobj->sd && kobj->sd->dir.subdirs;
+}
+
 /*
  * make sure cleaning up dir as the last step, we need to make
  * sure .release handler of kobject is run with holding the
diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index efd56f990a46..e1c600a377f7 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -117,23 +117,6 @@ extern void kobject_get_ownership(struct kobject *kobj,
 				  kuid_t *uid, kgid_t *gid);
 extern char *kobject_get_path(struct kobject *kobj, gfp_t flag);
 
-/**
- * kobject_has_children - Returns whether a kobject has children.
- * @kobj: the object to test
- *
- * This will return whether a kobject has other kobjects as children.
- *
- * It does NOT account for the presence of attribute files, only sub
- * directories. It also assumes there is no concurrent addition or
- * removal of such children, and thus relies on external locking.
- */
-static inline bool kobject_has_children(struct kobject *kobj)
-{
-	WARN_ON_ONCE(kref_read(&kobj->kref) == 0);
-
-	return kobj->sd && kobj->sd->dir.subdirs;
-}
-
 struct kobj_type {
 	void (*release)(struct kobject *kobj);
 	const struct sysfs_ops *sysfs_ops;