linux-kernel - [PATCH][next] btrfs: Avoid -Wflex-array-member-not-at-end warning

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Message-ID: <aN_Zeo7JH9nogwwq@kspp>
Date: Fri, 3 Oct 2025 15:11:06 +0100
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Chris Mason <clm@...com>, David Sterba <dsterba@...e.com>
Cc: linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org
Subject: [PATCH][next] btrfs: Avoid -Wflex-array-member-not-at-end warning

-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.

Move the conflicting declaration to the end of the corresponding
structure. Notice that `struct fs_path` is a flexible structure,
this is a structure that contains a flexible-array member (`char
inline_buf[];` in this case).

Fix the following warning:

fs/btrfs/send.c:181:24: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 fs/btrfs/send.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 9230e5066fc6..2b7cf49a35bb 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -178,7 +178,6 @@ struct send_ctx {
 	u64 cur_inode_rdev;
 	u64 cur_inode_last_extent;
 	u64 cur_inode_next_write_offset;
-	struct fs_path cur_inode_path;
 	bool cur_inode_new;
 	bool cur_inode_new_gen;
 	bool cur_inode_deleted;
@@ -305,6 +304,9 @@ struct send_ctx {
 
 	struct btrfs_lru_cache dir_created_cache;
 	struct btrfs_lru_cache dir_utimes_cache;
+
+	/* Must be last --ends in a flexible-array member. */
+	struct fs_path cur_inode_path;
 };
 
 struct pending_dir_move {
-- 
2.43.0