linux-kernel - [PATCH] block: use int type to store negative value

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Message-Id: <20250902130930.68317-1-rongqianfeng@vivo.com>
Date: Tue,  2 Sep 2025 21:09:30 +0800
From: Qianfeng Rong <rongqianfeng@...o.com>
To: Jens Axboe <axboe@...nel.dk>,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Qianfeng Rong <rongqianfeng@...o.com>
Subject: [PATCH] block: use int type to store negative value

Change the 'ret' variable in blk_stack_limits() from unsigned int to int,
as it needs to store negative value -1.

Storing the negative error codes in unsigned type, or performing equality
comparisons (e.g., ret == -1), doesn't cause an issue at runtime [1] but
can be confusing.  Additionally, assigning negative error codes to unsigned
type may trigger a GCC warning when the -Wsign-conversion flag is enabled.

No effect on runtime.

Link: https://lore.kernel.org/all/x3wogjf6vgpkisdhg3abzrx7v7zktmdnfmqeih5kosszmagqfs@oh3qxrgzkikf/ #1
Signed-off-by: Qianfeng Rong <rongqianfeng@...o.com>
---
 block/blk-settings.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/block/blk-settings.c b/block/blk-settings.c
index d6438e6c276d..693bc8d20acf 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -763,7 +763,8 @@ static void blk_stack_atomic_writes_limits(struct queue_limits *t,
 int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
 		     sector_t start)
 {
-	unsigned int top, bottom, alignment, ret = 0;
+	unsigned int top, bottom, alignment;
+	int ret = 0;
 
 	t->features |= (b->features & BLK_FEAT_INHERIT_MASK);
 
-- 
2.34.1