linux-kernel - Re: [PATCH 3/7] Input: libps2 - use BIT() for bitmask constants

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Message-ID: <2d0591a7-ccab-872f-d52d-c8adf51d4373@infradead.org>
Date:   Fri, 19 Jan 2018 14:26:20 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Lyude Paul <lyude@...hat.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/7] Input: libps2 - use BIT() for bitmask constants

On 01/19/2018 11:41 AM, Dmitry Torokhov wrote:
> Let's explicitly document bit numbers with BIT() macro.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>

Makes sense, but something should
#include <linux/bitops.h>

per Documentation/process/submit-checklist.rst Rule #1:
1) If you use a facility then #include the file that defines/declares
   that facility.  Don't depend on other header files pulling in ones
   that you use.


> ---
>  include/linux/libps2.h | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/libps2.h b/include/linux/libps2.h
> index 365c50b097ded..649295a5ff47d 100644
> --- a/include/linux/libps2.h
> +++ b/include/linux/libps2.h
> @@ -20,11 +20,11 @@
>  #define PS2_RET_NAK		0xfe
>  #define PS2_RET_ERR		0xfc
>  
> -#define PS2_FLAG_ACK		1	/* Waiting for ACK/NAK */
> -#define PS2_FLAG_CMD		2	/* Waiting for command to finish */
> -#define PS2_FLAG_CMD1		4	/* Waiting for the first byte of command response */
> -#define PS2_FLAG_WAITID		8	/* Command execiting is GET ID */
> -#define PS2_FLAG_NAK		16	/* Last transmission was NAKed */
> +#define PS2_FLAG_ACK		BIT(0)	/* Waiting for ACK/NAK */
> +#define PS2_FLAG_CMD		BIT(1)	/* Waiting for a command to finish */
> +#define PS2_FLAG_CMD1		BIT(2)	/* Waiting for the first byte of command response */
> +#define PS2_FLAG_WAITID		BIT(3)	/* Command executing is GET ID */
> +#define PS2_FLAG_NAK		BIT(4)	/* Last transmission was NAKed */
>  
>  struct ps2dev {
>  	struct serio *serio;
> 


-- 
~Randy