When compiling with -Wformat, clang emits the following warning:

drivers/net/ethernet/freescale/xgmac_mdio.c:243:22: warning: format
specifies type 'unsigned char' but the argument has type 'int'
[-Wformat]
                        phy_id, dev_addr, regnum);
                                          ^~~~~~
./include/linux/dev_printk.h:163:47: note: expanded from macro 'dev_dbg'
                dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
                                                    ~~~     ^~~~~~~~~~~
./include/linux/dev_printk.h:129:34: note: expanded from macro 'dev_printk'
                _dev_printk(level, dev, fmt, ##__VA_ARGS__);            \
                                        ~~~    ^~~~~~~~~~~

The types of these arguments are unconditionally defined, so this patch
updates the format character to the correct ones for ints and unsigned
ints.

Link: ClangBuiltLinux/linux#378
Signed-off-by: Bill Wendling <morbo@google.com>
---
 drivers/net/ethernet/freescale/xgmac_mdio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/xgmac_mdio.c b/drivers/net/ethernet/freescale/xgmac_mdio.c
index 266e562bd67a..1d5d09d2eb41 100644
--- a/drivers/net/ethernet/freescale/xgmac_mdio.c
+++ b/drivers/net/ethernet/freescale/xgmac_mdio.c
@@ -239,7 +239,7 @@ static int xgmac_mdio_read(struct mii_bus *bus, int phy_id, int regnum)
 	if ((xgmac_read32(&regs->mdio_stat, endian) & MDIO_STAT_RD_ER) &&
 	    !priv->has_a011043) {
 		dev_dbg(&bus->dev,
-			"Error while reading PHY%d reg at %d.%hhu\n",
+			"Error while reading PHY%d reg at %d.%d\n",
 			phy_id, dev_addr, regnum);
 		ret = 0xffff;
 	} else {
-- 
2.35.1.723.g4982287a31-goog

Hello:

This patch was applied to netdev/net-next.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Wed, 16 Mar 2022 14:31:14 -0700 you wrote:
> When compiling with -Wformat, clang emits the following warning:
> 
> drivers/net/ethernet/freescale/xgmac_mdio.c:243:22: warning: format
> specifies type 'unsigned char' but the argument has type 'int'
> [-Wformat]
>                         phy_id, dev_addr, regnum);
>                                           ^~~~~~
> ./include/linux/dev_printk.h:163:47: note: expanded from macro 'dev_dbg'
>                 dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
>                                                     ~~~     ^~~~~~~~~~~
> ./include/linux/dev_printk.h:129:34: note: expanded from macro 'dev_printk'
>                 _dev_printk(level, dev, fmt, ##__VA_ARGS__);            \
>                                         ~~~    ^~~~~~~~~~~
> 
> [...]

Here is the summary with links:
  - net/fsl: xgmac_mdio: use correct format characters
    https://git.kernel.org/netdev/net-next/c/c011072c9035

You are awesome, thank you!
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