linux-kernel - [PATCH v3] fs/ext4: replace ternary operator with min()/max() and min

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Date:   Tue, 16 Aug 2022 09:15:53 +0800
From:   Jiangshan Yi <13667453960@....com>
To:     tytso@....edu, adilger.kernel@...ger.ca
Cc:     lczerner@...hat.com, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jiangshan Yi <yijiangshan@...inos.cn>
Subject: [PATCH v3] fs/ext4: replace ternary operator with min()/max() and min_t()

From: Jiangshan Yi <yijiangshan@...inos.cn>

Fix the following coccicheck warning:

fs/ext4/inline.c:183: WARNING opportunity for min().
fs/ext4/extents.c:2631: WARNING opportunity for max().
fs/ext4/extents.c:2632: WARNING opportunity for min().
fs/ext4/extents.c:5559: WARNING opportunity for max().
fs/ext4/super.c:6908: WARNING opportunity for min().

min()/max() and min_t() macro is defined in include/linux/minmax.h.
It avoids multiple evaluations of the arguments when non-constant and
performs strict type-checking.

Suggested-by: Lukas Czerner <lczerner@...hat.com>
Signed-off-by: Jiangshan Yi <yijiangshan@...inos.cn>
Reviewed-by: Lukas Czerner <lczerner@...hat.com>
---
 fs/ext4/extents.c | 8 +++-----
 fs/ext4/inline.c  | 3 +--
 fs/ext4/super.c   | 3 +--
 3 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index c148bb97b527..37321aecd878 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2628,9 +2628,8 @@ ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
 			  unwritten, ex_ee_len);
 		path[depth].p_ext = ex;
 
-		a = ex_ee_block > start ? ex_ee_block : start;
-		b = ex_ee_block+ex_ee_len - 1 < end ?
-			ex_ee_block+ex_ee_len - 1 : end;
+		a = max(ex_ee_block, start);
+		b = min(ex_ee_block + ex_ee_len - 1, end);
 
 		ext_debug(inode, "  border %u:%u\n", a, b);
 
@@ -5557,8 +5556,7 @@ static int ext4_insert_range(struct file *file, loff_t offset, loff_t len)
 	 * ee_start_lblk to shift extents
 	 */
 	ret = ext4_ext_shift_extents(inode, handle,
-		ee_start_lblk > offset_lblk ? ee_start_lblk : offset_lblk,
-		len_lblk, SHIFT_RIGHT);
+		max(ee_start_lblk, offset_lblk), len_lblk, SHIFT_RIGHT);
 
 	up_write(&EXT4_I(inode)->i_data_sem);
 	if (IS_SYNC(inode))
diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index a4fbe825694b..2b42ececa46d 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -180,8 +180,7 @@ static int ext4_read_inline_data(struct inode *inode, void *buffer,
 
 	BUG_ON(len > EXT4_I(inode)->i_inline_size);
 
-	cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
-			len : EXT4_MIN_INLINE_DATA_SIZE;
+	cp_len = min_t(unsigned int, len, EXT4_MIN_INLINE_DATA_SIZE);
 
 	raw_inode = ext4_raw_inode(iloc);
 	memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 9a66abcca1a8..5615bf7ab15d 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -6905,8 +6905,7 @@ static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
 		len = i_size-off;
 	toread = len;
 	while (toread > 0) {
-		tocopy = sb->s_blocksize - offset < toread ?
-				sb->s_blocksize - offset : toread;
+		tocopy = min(sb->s_blocksize - offset, toread);
 		bh = ext4_bread(NULL, inode, blk, 0);
 		if (IS_ERR(bh))
 			return PTR_ERR(bh);
-- 
2.25.1