linux-kernel - [PATCH] block: uapi: Fix compliation warning of using IOPRIO_PRIO

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Date: Fri, 31 May 2024 19:31:11 +0800
From: Zhiguo Niu <zhiguo.niu@...soc.com>
To: <axboe@...nel.dk>
CC: <bvanassche@....org>, <dlemoal@...nel.org>, <linux-kernel@...r.kernel.org>,
        <niuzhiguo84@...il.com>, <zhiguo.niu@...soc.com>, <ke.wang@...soc.com>
Subject: [PATCH] block: uapi: Fix compliation warning of using IOPRIO_PRIO_DATA

Generally, the input of IOPRIO_PRIO_DATA has 16 bits. If use format "%d"
to printk IOPRIO_PRIO_DATA, there will be the following warning or error.

fs/f2fs/sysfs.c:348:31: warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘long unsigned int’ [-Wformat=]
   return sysfs_emit(buf, "%s,%d\n",
                              ~^
                              %ld

This is because the output of IOPRIO_PRIO_DATA is converted to "UL" from
IOPRIO_PRIO_MASK, which is not reasonable. unsigned int is more suitable.

Signed-off-by: Zhiguo Niu <zhiguo.niu@...soc.com>
---
 include/uapi/linux/ioprio.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/uapi/linux/ioprio.h b/include/uapi/linux/ioprio.h
index bee2bdb0..9ead07f 100644
--- a/include/uapi/linux/ioprio.h
+++ b/include/uapi/linux/ioprio.h
@@ -11,7 +11,7 @@
 #define IOPRIO_CLASS_SHIFT	13
 #define IOPRIO_NR_CLASSES	8
 #define IOPRIO_CLASS_MASK	(IOPRIO_NR_CLASSES - 1)
-#define IOPRIO_PRIO_MASK	((1UL << IOPRIO_CLASS_SHIFT) - 1)
+#define IOPRIO_PRIO_MASK	((1U << IOPRIO_CLASS_SHIFT) - 1)
 
 #define IOPRIO_PRIO_CLASS(ioprio)	\
 	(((ioprio) >> IOPRIO_CLASS_SHIFT) & IOPRIO_CLASS_MASK)
-- 
1.9.1