linux-kernel - [PATCH 2/4] btrfs: define the AUTO_K(V)FREE

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Message-ID: <20251021142749.642956-3-mssola@mssola.com>
Date: Tue, 21 Oct 2025 16:27:47 +0200
From: Miquel Sabaté Solà <mssola@...ola.com>
To: linux-btrfs@...r.kernel.org
Cc: clm@...com,
	dsterba@...e.com,
	johannes.thumshirn@....com,
	fdmanana@...e.com,
	boris@....io,
	wqu@...e.com,
	neal@...pa.dev,
	linux-kernel@...r.kernel.org,
	Miquel Sabaté Solà <mssola@...ola.com>,
	David Sterba <dsterba@...e.cz>
Subject: [PATCH 2/4] btrfs: define the AUTO_K(V)FREE_PTR helper macros

These are two simple macros which ensure that a pointer is initialized
to NULL and with the proper cleanup attribute for it.

Suggested-by: David Sterba <dsterba@...e.cz>
Signed-off-by: Miquel Sabaté Solà <mssola@...ola.com>
---
 fs/btrfs/misc.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/btrfs/misc.h b/fs/btrfs/misc.h
index 60f9b000d644..0e33327e70d9 100644
--- a/fs/btrfs/misc.h
+++ b/fs/btrfs/misc.h
@@ -13,6 +13,13 @@
 #include <linux/rbtree.h>
 #include <linux/bio.h>
 
+/*
+ * Convenient macros to define a pointer with the __free(kfree) and
+ * __free(kvfree) cleanup attributes and initialized to NULL.
+ */
+#define AUTO_KFREE_PTR(name)       *name __free(kfree) = NULL
+#define AUTO_KVFREE_PTR(name)      *name __free(kvfree) = NULL
+
 /*
  * Enumerate bits using enum autoincrement. Define the @name as the n-th bit.
  */
-- 
2.51.1