linux-kernel - Re: [PATCH v2 5/6] serial: Use UART_XMIT

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Date:   Thu, 23 Jun 2022 09:30:09 +0200
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        linux-serial@...r.kernel.org, Greg KH <gregkh@...uxfoundation.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Andreas Färber <afaerber@...e.de>,
        Manivannan Sadhasivam <mani@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org,
        linux-actions@...ts.infradead.org, linux-unisoc@...ts.infradead.org
Subject: Re: [PATCH v2 5/6] serial: Use UART_XMIT_SIZE

On 21. 06. 22, 14:49, Ilpo Järvinen wrote:
> --- a/include/linux/serial.h
> +++ b/include/linux/serial.h
> @@ -9,7 +9,6 @@
>   #ifndef _LINUX_SERIAL_H
>   #define _LINUX_SERIAL_H
>   
> -#include <asm/page.h>
>   #include <uapi/linux/serial.h>
>   
>   /* Helper for dealing with UART_LCR_WLEN* defines */
> @@ -25,11 +24,6 @@ struct async_icount {
>   	__u32	buf_overrun;
>   };
>   
> -/*
> - * The size of the serial xmit buffer is 1 page, or 4096 bytes
> - */
> -#define SERIAL_XMIT_SIZE PAGE_SIZE
> -
>   #include <linux/compiler.h>
>   
>   #endif /* _LINUX_SERIAL_H */
> diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
> index 5518b70177b3..1767dee98021 100644
> --- a/include/linux/serial_core.h
> +++ b/include/linux/serial_core.h
> @@ -296,6 +296,7 @@ struct uart_state {
>   	struct uart_port	*uart_port;
>   };
>   
> +/* The size of the serial xmit buffer is 1 page, or 4096 bytes */

That is not completely true, I'd remove the "or" part. Hmm, but then the 
comment is somehow superfluous as it says what we can see below. So 
maybe don't add it at all?

>   #define UART_XMIT_SIZE	PAGE_SIZE

thanks,
-- 
js
suse labs