linux-kernel - RE: [PATCH v6 1/2] tty: serial: Cleanup the bit shift with macro

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Message-ID: <fc17322010b049529054552bd44f63f1@dh-electronics.com>
Date: Thu, 18 Jan 2024 09:29:10 +0000
From: Christoph Niedermaier <cniedermaier@...electronics.com>
To: Greg KH <gregkh@...uxfoundation.org>
CC: "crescentcy.hsieh@...a.com" <crescentcy.hsieh@...a.com>,
	"jirislaby@...nel.org" <jirislaby@...nel.org>, "LinoSanfilippo@....de"
	<LinoSanfilippo@....de>, "lukas@...ner.de" <lukas@...ner.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v6 1/2] tty: serial: Cleanup the bit shift with macro

From: Greg KH <gregkh@...uxfoundation.org>
Sent: Thursday, January 18, 2024 8:02 AM
> On Wed, Jan 17, 2024 at 03:56:23PM +0100, Christoph Niedermaier wrote:
>> Hi everyone,
>>
>>> This patch replaces the bit shift code with "_BITUL()" macro inside
>>> "serial_rs485" struct.
>>>
>>> Signed-off-by: Crescent CY Hsieh <crescentcy.hsieh@...a.com>
>>> ---
>>>  include/uapi/linux/serial.h | 17 +++++++++--------
>>>  1 file changed, 9 insertions(+), 8 deletions(-)
>>>
>>> diff --git a/include/uapi/linux/serial.h b/include/uapi/linux/serial.h
>>> index 53bc1af67..6c75ebdd7 100644
>>> --- a/include/uapi/linux/serial.h
>>> +++ b/include/uapi/linux/serial.h
>>> @@ -11,6 +11,7 @@
>>>  #ifndef _UAPI_LINUX_SERIAL_H
>>>  #define _UAPI_LINUX_SERIAL_H
>>>
>>> +#include <linux/const.h>
>>>  #include <linux/types.h>
>>>
>>>  #include <linux/tty_flags.h>
>>> @@ -140,14 +141,14 @@ struct serial_icounter_struct {
>>>   */
>>>  struct serial_rs485 {
>>>     __u32   flags;
>>> -#define SER_RS485_ENABLED          (1 << 0)
>>> -#define SER_RS485_RTS_ON_SEND              (1 << 1)
>>> -#define SER_RS485_RTS_AFTER_SEND   (1 << 2)
>>
>> In the old definition (1 << 3) wasn't used.
>>
>>> -#define SER_RS485_RX_DURING_TX             (1 << 4)
>>> -#define SER_RS485_TERMINATE_BUS            (1 << 5)
>>> -#define SER_RS485_ADDRB                    (1 << 6)
>>> -#define SER_RS485_ADDR_RECV                (1 << 7)
>>> -#define SER_RS485_ADDR_DEST                (1 << 8)
>>> +#define SER_RS485_ENABLED          _BITUL(0)
>>> +#define SER_RS485_RTS_ON_SEND              _BITUL(1)
>>> +#define SER_RS485_RTS_AFTER_SEND   _BITUL(2)
>>> +#define SER_RS485_RX_DURING_TX             _BITUL(3)
>>
>> Isn't it a break if number 3 isn't skipped here as well?
> 
> Ugh, yes it is, good catch!
> 
> Care to send a patch to fix this up?

OK, I'll make a patch.

Regards
Christoph