linux-kernel - Re: [PATCH 1/5] tty: serial: define UART_LCR

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Date:   Thu, 24 Feb 2022 11:10:20 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jiri Slaby <jslaby@...e.cz>
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] tty: serial: define UART_LCR_WLEN() macro

On Thu, Feb 24, 2022 at 10:55:54AM +0100, Jiri Slaby wrote:
> Define a generic UART_LCR_WLEN() macro with a size argument. It can be
> used to encode byte size into an LCR value. Therefore we can use it to
> simplify the drivers using tty_get_char_size() in the next patches.
> 
> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> ---
>  include/uapi/linux/serial_reg.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/include/uapi/linux/serial_reg.h b/include/uapi/linux/serial_reg.h
> index f51bc8f36813..c9d5ff6dd4c6 100644
> --- a/include/uapi/linux/serial_reg.h
> +++ b/include/uapi/linux/serial_reg.h
> @@ -111,6 +111,7 @@
>  #define UART_LCR_WLEN6		0x01 /* Wordlength: 6 bits */
>  #define UART_LCR_WLEN7		0x02 /* Wordlength: 7 bits */
>  #define UART_LCR_WLEN8		0x03 /* Wordlength: 8 bits */
> +#define UART_LCR_WLEN(x)	((x) - 5)

I'm all for this, but why does it need to be in a uapi .h file?

thanks,

greg k-h