linux-kernel - Re: [PATCHv2-next 2/3] serial/sysrq: Add MAGIC_SYSRQ_SERIAL

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Message-ID: <7a1ba665-fc32-8dd9-ffa1-de71209d0153@infradead.org>
Date:   Tue, 14 Jan 2020 09:51:46 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Dmitry Safonov <dima@...sta.com>, linux-kernel@...r.kernel.org
Cc:     Dmitry Safonov <0x7f454c46@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        Jiri Slaby <jslaby@...e.com>, Joe Perches <joe@...ches.com>,
        Vasiliy Khoruzhick <vasilykh@...sta.com>,
        linux-serial@...r.kernel.org
Subject: Re: [PATCHv2-next 2/3] serial/sysrq: Add MAGIC_SYSRQ_SERIAL_SEQUENCE

On 1/14/20 9:19 AM, Dmitry Safonov wrote:
> +static bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch)
> +{
> +	if (ARRAY_SIZE(sysrq_toggle_seq) <= 1)
> +		return 0;
> +
> +	BUILD_BUG_ON(ARRAY_SIZE(sysrq_toggle_seq) >= sizeof(port->sysrq_seq)*U8_MAX);

That sizeof(...) is confusing (to me).  I would just write:

+	BUILD_BUG_ON(ARRAY_SIZE(sysrq_toggle_seq) >= U8_MAX);

> +	if (sysrq_toggle_seq[port->sysrq_seq] != ch) {
> +		port->sysrq_seq = 0;
> +		return 0;
> +	}

cheers.
-- 
~Randy