linux-kernel - [PATCH] tty: gdm724x: use min_t() for size

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Date:   Wed, 16 Aug 2023 10:53:22 +0200
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Jiri Slaby (SUSE)" <jirislaby@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH] tty: gdm724x: use min_t() for size_t varable and a constant

My thinking was that ulong is the same as size_t everywhere. No, size_t
is uint on 32bit. So the below commit introduced a build warning on
32bit:
.../gdm724x/gdm_tty.c:165:24: warning: comparison of distinct pointer types ('typeof (2048UL) *' (aka 'unsigned long *') and 'typeof (remain) *' (aka 'unsigned int *'))

To fix this, partially revert the commit (remove constants' suffixes)
and switch to min_t() in this case instead.

/me would hope for Z (or alike) suffix for constants.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
Fixes: c3e5c706aefc (tty: gdm724x: convert counts to size_t)
Reported-by: Nathan Chancellor <nathan@...nel.org>
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202308151953.rNNnAR2N-lkp@intel.com/
---
 drivers/staging/gdm724x/gdm_tty.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/gdm724x/gdm_tty.c b/drivers/staging/gdm724x/gdm_tty.c
index 67d9bf41e836..32b2e817ff04 100644
--- a/drivers/staging/gdm724x/gdm_tty.c
+++ b/drivers/staging/gdm724x/gdm_tty.c
@@ -17,9 +17,9 @@
 #define GDM_TTY_MAJOR 0
 #define GDM_TTY_MINOR 32
 
-#define WRITE_SIZE 2048UL
+#define WRITE_SIZE 2048
 
-#define MUX_TX_MAX_SIZE 2048UL
+#define MUX_TX_MAX_SIZE 2048
 
 static inline bool gdm_tty_ready(struct gdm *gdm)
 {
@@ -159,7 +159,7 @@ static ssize_t gdm_tty_write(struct tty_struct *tty, const u8 *buf, size_t len)
 		return -ENODEV;
 
 	while (remain) {
-		size_t sending_len = min(MUX_TX_MAX_SIZE, remain);
+		size_t sending_len = min_t(size_t, MUX_TX_MAX_SIZE, remain);
 		gdm->tty_dev->send_func(gdm->tty_dev->priv_dev,
 					(void *)(buf + sent_len),
 					sending_len,
-- 
2.41.0