linux-ext4 - [PATCH] ext4: avoid unused-variable warning with CONFIG

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Date:   Fri, 21 Apr 2023 09:08:11 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     "Theodore Ts'o" <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jason Yan <yanaijie@...wei.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Jan Kara <jack@...e.cz>,
        Ritesh Harjani <ritesh.list@...il.com>,
        Eric Biggers <ebiggers@...gle.com>,
        Ye Bin <yebin10@...wei.com>, Baokun Li <libaokun1@...wei.com>,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ext4: avoid unused-variable warning with CONFIG_QUOTA=n

From: Arnd Bergmann <arnd@...db.de>

After some code reshuffling, the index variables in two functions
are only used in an #ifdef:

fs/ext4/super.c: In function 'ext4_put_super':
fs/ext4/super.c:1262:13: error: unused variable 'i' [-Werror=unused-variable]
fs/ext4/super.c: In function '__ext4_fill_super':
fs/ext4/super.c:5200:22: error: unused variable 'i' [-Werror=unused-variable]

Since all supported compilers now allow having variable declarations
inside of a for() loop, move them into the #ifdef block directly.

Fixes: dcbf87589d90 ("ext4: factor out ext4_flex_groups_free()")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 fs/ext4/super.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index d03bf0ecf505..9b331ef593ea 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1259,7 +1259,7 @@ static void ext4_put_super(struct super_block *sb)
 	struct ext4_sb_info *sbi = EXT4_SB(sb);
 	struct ext4_super_block *es = sbi->s_es;
 	int aborted = 0;
-	int i, err;
+	int err;
 
 	/*
 	 * Unregister sysfs before destroying jbd2 journal.
@@ -1311,7 +1311,7 @@ static void ext4_put_super(struct super_block *sb)
 	ext4_flex_groups_free(sbi);
 	ext4_percpu_param_destroy(sbi);
 #ifdef CONFIG_QUOTA
-	for (i = 0; i < EXT4_MAXQUOTAS; i++)
+	for (int i = 0; i < EXT4_MAXQUOTAS; i++)
 		kfree(get_qf_name(sb, sbi, i));
 #endif
 
@@ -5197,7 +5197,6 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
 	ext4_fsblk_t logical_sb_block;
 	struct inode *root;
 	int ret = -ENOMEM;
-	unsigned int i;
 	int needs_recovery;
 	int err = 0;
 	ext4_group_t first_not_zeroed;
@@ -5628,7 +5627,7 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
 #endif
 
 #ifdef CONFIG_QUOTA
-	for (i = 0; i < EXT4_MAXQUOTAS; i++)
+	for (int i = 0; i < EXT4_MAXQUOTAS; i++)
 		kfree(get_qf_name(sb, sbi, i));
 #endif
 	fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);
-- 
2.39.2