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[PATCH 1/2] xfs: fix sparse inodes 32-bit compile failure

To: xfs@xxxxxxxxxxx
Subject: [PATCH 1/2] xfs: fix sparse inodes 32-bit compile failure
From: Brian Foster <bfoster@xxxxxxxxxx>
Date: Mon, 1 Jun 2015 10:33:13 -0400
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <1433169194-41808-1-git-send-email-bfoster@xxxxxxxxxx>
References: <1433169194-41808-1-git-send-email-bfoster@xxxxxxxxxx>
The kbuild test robot reports the following compilation failure with a
32-bit kernel configuration:

        fs/built-in.o: In function `xfs_ifree_cluster':
        >> xfs_inode.c:(.text+0x17ac84): undefined reference to `__umoddi3'

This is due to the use of the modulus operator on a 64-bit variable in
the ASSERT() added as part of the following commit:

        xfs: skip unallocated regions of inode chunks in xfs_ifree_cluster()

This ASSERT() simply checks that the offset of the inode in a sparse
cluster is appropriately aligned. Since the maximum inode record offset
is 63 (for a 64 inode record) and the calculated offset here should be
something less than that, cast the offset value to a 32-bit type before
the mod to prevent the error.

Reported-by: kbuild test robot <fengguang.wu@xxxxxxxxx>
Signed-off-by: Brian Foster <bfoster@xxxxxxxxxx>
 fs/xfs/xfs_inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 4c054f6..16bd01b 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -2265,7 +2265,7 @@ xfs_ifree_cluster(
                 * a sparse region.
                if ((xic->alloc & XFS_INOBT_MASK(inum - xic->first_ino)) == 0) {
-                       ASSERT(((inum - xic->first_ino) %
+                       ASSERT(((int)(inum - xic->first_ino) %
                                inodes_per_cluster) == 0);

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