FAILED: patch "[PATCH] xfs: cross-reference the primary superblock" failed to apply to 6.1-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x 0c61016006ab08f8346f9e7b1e38559bd4ea499e
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026110440-single-collision-69cc@gregkh' --subject-prefix 'PATCH 6.1.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 0c61016006ab08f8346f9e7b1e38559bd4ea499e Mon Sep 17 00:00:00 2001
From: "Darrick J. Wong" <djwong@kernel.org>
Date: Thu, 24 Sep 2026 21:11:32 -0700
Subject: [PATCH] xfs: cross-reference the primary superblock

Make sure we cross-reference the primary superblock against the rest of
the AG 0 space metadata.  Drop the unused @bp parameter of
xchk_superblock_xref to avoid complaints about uninitialized variables.

Cc: stable@vger.kernel.org # v4.16
Fixes: 52dc4b44af7419 ("xfs: cross-reference with the bnobt")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

diff --git a/fs/xfs/scrub/agheader.c b/fs/xfs/scrub/agheader.c
index fa5d32ec020a..1dff6cb1b936 100644
--- a/fs/xfs/scrub/agheader.c
+++ b/fs/xfs/scrub/agheader.c
@@ -35,8 +35,7 @@ xchk_setup_agheader(
 /* Cross-reference with the other btrees. */
 STATIC void
 xchk_superblock_xref(
-	struct xfs_scrub	*sc,
-	struct xfs_buf		*bp)
+	struct xfs_scrub	*sc)
 {
 	struct xfs_mount	*mp = sc->mp;
 	xfs_agnumber_t		agno = sc->sm->sm_agno;
@@ -106,16 +105,12 @@ xchk_superblock(
 	struct xfs_dsb		*sb;
 	struct xfs_perag	*pag;
 	size_t			sblen;
-	xfs_agnumber_t		agno;
+	xfs_agnumber_t		agno = sc->sm->sm_agno;
 	uint32_t		v2_ok;
 	__be32			features_mask;
 	int			error;
 	__be16			vernum_mask;
 
-	agno = sc->sm->sm_agno;
-	if (agno == 0)
-		return 0;
-
 	/*
 	 * Grab an active reference to the perag structure.  If we can't get
 	 * it, we're racing with something that's tearing down the AG, so
@@ -125,6 +120,9 @@ xchk_superblock(
 	if (!pag)
 		return -ENOENT;
 
+	if (agno == 0)
+		goto out_xref;
+
 	error = xfs_sb_read_secondary(mp, sc->tp, agno, &bp);
 	/*
 	 * The superblock verifier can return several different error codes
@@ -430,7 +428,8 @@ xchk_superblock(
 	if (memchr_inv((char *)sb + sblen, 0, BBTOB(bp->b_length) - sblen))
 		xchk_block_set_corrupt(sc, bp);
 
-	xchk_superblock_xref(sc, bp);
+out_xref:
+	xchk_superblock_xref(sc);
 out_pag:
 	xfs_perag_put(pag);
 	return error;