linux-kernel - Re: [PATCH v2 4/4] serial: Add kserial_rs485 to avoid wasted space due to .padding

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Message-ID: <1068ad37-d80c-6e63-6cd9-6ecf6c256d46@kernel.org>
Date:   Tue, 30 Aug 2022 10:01:59 +0200
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-serial@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Jonathan Corbet <corbet@....net>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Russell King <linux@...linux.org.uk>,
        Richard Genoud <richard.genoud@...il.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com
Cc:     Lino Sanfilippo <LinoSanfilippo@....de>
Subject: Re: [PATCH v2 4/4] serial: Add kserial_rs485 to avoid wasted space
 due to .padding

On 30. 08. 22, 9:29, Ilpo Järvinen wrote:
> --- a/include/linux/serial_core.h
> +++ b/include/linux/serial_core.h
> @@ -31,6 +31,29 @@ struct serial_struct;
...
> + * Must match with struct serial_rs485 in include/uapi/linux/serial.h excluding
> + * the padding.

Have you considered BUILD_BUG_ON() checks with few offset_of()s to 
enforce the above?

> +struct kserial_rs485 {
> +	__u32	flags;
> +	__u32	delay_rts_before_send;
> +	__u32	delay_rts_after_send;
> +	struct {
> +		__u8    addr_recv;
> +		__u8    addr_dest;
> +	};
> +};

thanks,
-- 
js
suse labs