linux-kernel - Re: [PATCH v1 06/14] serial: 8250_bcm7271: Switch to use uart_read_port

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Date: Fri, 23 Feb 2024 17:01:43 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: kernel test robot <lkp@...el.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-aspeed@...ts.ozlabs.org, linux-rpi-kernel@...ts.infradead.org,
	linux-mips@...r.kernel.org, linux-tegra@...r.kernel.org,
	oe-kbuild-all@...ts.linux.dev, Jiri Slaby <jirislaby@...nel.org>,
	Joel Stanley <joel@....id.au>,
	Andrew Jeffery <andrew@...econstruct.com.au>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Al Cooper <alcooperx@...il.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Paul Cercueil <paul@...pouillou.net>,
	Vladimir Zapolskiy <vz@...ia.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
	Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH v1 06/14] serial: 8250_bcm7271: Switch to use
 uart_read_port_properties()

On Fri, Feb 23, 2024 at 12:14:38PM +0800, kernel test robot wrote:
> Hi Andy,
> 
> kernel test robot noticed the following build warnings:

> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202402231238.AWqLyIoM-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 

>    In file included from arch/hexagon/include/asm/io.h:328:
>    include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
>      547 |         val = __raw_readb(PCI_IOBASE + addr);
>          |                           ~~~~~~~~~~ ^

Okay, the above is well known issue with hexagon arch, not related to the series.

> >> drivers/tty/serial/8250/8250_bcm7271.c:938:22: warning: unused variable 'np' [-Wunused-variable]
>      938 |         struct device_node *np = pdev->dev.of_node;
>          |                             ^~

This one is a good catch! Will be fixed in a new version.

-- 
With Best Regards,
Andy Shevchenko