linux-kernel - [PATCH] fs/quota: erase unused but set variable warning

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Date:   Wed, 24 Apr 2019 08:58:57 +0800
From:   Jiang Biao <benbjiang@...cent.com>
To:     <jack@...e.com>
CC:     <linux-kernel@...r.kernel.org>, <benbjiang@...cent.com>
Subject: [PATCH] fs/quota: erase unused but set variable warning

Local variable *reserved* of remove_dquot_ref() is only used if
define CONFIG_QUOTA_DEBUG, but not ebraced in CONFIG_QUOTA_DEBUG
macro, which leads to unused-but-set-variable warning when compiling.

This patch ebrace it into CONFIG_QUOTA_DEBUG macro like what is done
in add_dquot_ref().

Signed-off-by: Jiang Biao <benbjiang@...cent.com>
---
 fs/quota/dquot.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index fc20e06c56ba..14ee4c6deba1 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -1049,7 +1049,9 @@ static void remove_dquot_ref(struct super_block *sb, int type,
 		struct list_head *tofree_head)
 {
 	struct inode *inode;
+#ifdef CONFIG_QUOTA_DEBUG
 	int reserved = 0;
+#endif
 
 	spin_lock(&sb->s_inode_list_lock);
 	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
@@ -1061,8 +1063,10 @@ static void remove_dquot_ref(struct super_block *sb, int type,
 		 */
 		spin_lock(&dq_data_lock);
 		if (!IS_NOQUOTA(inode)) {
+#ifdef CONFIG_QUOTA_DEBUG
 			if (unlikely(inode_get_rsv_space(inode) > 0))
 				reserved = 1;
+#endif
 			remove_inode_dquot_ref(inode, type, tofree_head);
 		}
 		spin_unlock(&dq_data_lock);
-- 
2.17.2 (Apple Git-113)