linux-kernel - [PATCH 5/8] lockref: add a lockref

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Message-ID: <20250115094702.504610-6-hch@lst.de>
Date: Wed, 15 Jan 2025 10:46:41 +0100
From: Christoph Hellwig <hch@....de>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Al Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Gao Xiang <xiang@...nel.org>,
	Chao Yu <chao@...nel.org>,
	Andreas Gruenbacher <agruenba@...hat.com>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-erofs@...ts.ozlabs.org,
	gfs2@...ts.linux.dev
Subject: [PATCH 5/8] lockref: add a lockref_init helper

Add a helper to initialize the lockdep, that is initialize the spinlock
and set a value.  Having to open code them isn't a big deal, but having
an initializer feels right for a proper primitive.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 include/linux/lockref.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/lockref.h b/include/linux/lockref.h
index f821f46e9fb4..c39f119659ba 100644
--- a/include/linux/lockref.h
+++ b/include/linux/lockref.h
@@ -34,6 +34,17 @@ struct lockref {
 	};
 };
 
+/**
+ * lockref_init - Initialize a lockref
+ * @lockref: pointer to lockref structure
+ * @count: initial count
+ */
+static inline void lockref_init(struct lockref *lockref, unsigned int count)
+{
+	spin_lock_init(&lockref->lock);
+	lockref->count = count;
+}
+
 void lockref_get(struct lockref *lockref);
 int lockref_put_return(struct lockref *lockref);
 bool lockref_get_not_zero(struct lockref *lockref);
-- 
2.45.2