linux-kernel - [PATCH] xfs: hide unused variable

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Message-Id: <1460838665-1249242-1-git-send-email-arnd@arndb.de>
Date:	Sat, 16 Apr 2016 22:30:36 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Dave Chinner <david@...morbit.com>
Cc:	Arnd Bergmann <arnd@...db.de>, xfs@....sgi.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH] xfs: hide unused variable

The newly added xfs_finish_page_writeback() function causes
a harmless gcc warning when debugging is disabled:

fs/xfs/xfs_aops.c: In function 'xfs_finish_page_writeback':
fs/xfs/xfs_aops.c:97:16: error: unused variable 'blockmask' [-Werror=unused-variable]
  unsigned int  blockmask = (1 << inode->i_blkbits) - 1;
                ^~~~~~~~~

This adds an #ifdef around the variable declaration to hide
it whenever the ASSERT macro is defined as a stub, following
the same style as used elsewhere in xfs.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Fixes: 37992c18bba3 ("xfs: don't release bios on completion immediately")
---
 fs/xfs/xfs_aops.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index e5c3a457c191..737d028914a2 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -94,7 +94,9 @@ xfs_finish_page_writeback(
 	struct bio_vec		*bvec,
 	int			error)
 {
+#if defined(DEBUG) || defined(XFS_WARN)
 	unsigned int		blockmask = (1 << inode->i_blkbits) - 1;
+#endif
 	unsigned int		end = bvec->bv_offset + bvec->bv_len - 1;
 	struct buffer_head	*head, *bh;
 	unsigned int		off = 0;
-- 
2.7.0