linux-kernel - Re: [PATCH v2] x86/early_printk: add MMIO-based UARTs

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Message-ID: <Z9fWMaX25c8GIaQK@gmail.com>
Date: Mon, 17 Mar 2025 08:58:41 +0100
From: Ingo Molnar <mingo@...nel.org>
To: dmukhin@...d.com
Cc: Jonathan Corbet <corbet@....net>, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] x86/early_printk: add MMIO-based UARTs


* Denis Mukhin via B4 Relay <devnull+dmukhin.ford.com@...nel.org> wrote:

> +	if (!strncmp(s, "nocfg", 5))
> +		baudrate = 0;
> +	else {
> +		baudrate = simple_strtoul(s, &e, 0);
> +		if (baudrate == 0 || s == e)
> +			baudrate = DEFAULT_BAUD;
> +	}

In standard kernel coding style we always balance curly braces and 
don't skip them in the single-statement case. Ie. the above should be:

	if (!strncmp(s, "nocfg", 5)) {
		baudrate = 0;
	} else {


> +	if (baudrate)
> +		early_serial_hw_init(115200 / baudrate);

Hm, I think that division will go poorly if 'baudrate' ends up being 0 
in the 'nocfg' case ... ;-)

Thanks,

	Ingo