linux-kernel - Re: [PATCH v2 10/11] tty: serial: 8250: Replace printk by pr

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Date:	Fri, 18 Dec 2015 14:32:06 +0200
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Anton Wuerfel <anton.wuerfel@....de>, linux-serial@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Helge Deller <deller@....de>,
	Peter Hurley <peter@...leysoftware.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Qipeng Zha <qipeng.zha@...el.com>,
	Desmond Liu <desmondl@...adcom.com>,
	Wang Long <long.wanglong@...wei.com>,
	Matt Redfearn <matt.redfearn@...tec.com>,
	Paul Burton <paul.burton@...tec.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Peter Hung <hpeter@...il.com>,
	Soeren Grunewald <soeren.grunewald@...y.de>,
	Adam Lee <adam.lee@...onical.com>,
	"Maciej S. Szmigiero" <mail@...iej.szmigiero.name>,
	Mans Rullgard <mans@...sr.com>, linux-kernel@...r.kernel.org,
	linux-parisc@...r.kernel.org, linux-kernel@...cs.fau.de,
	Phillip Raffeck <phillip.raffeck@....de>
Subject: Re: [PATCH v2 10/11] tty: serial: 8250: Replace printk by pr_*

On Fri, 2015-12-18 at 12:22 +0100, Anton Wuerfel wrote:


>  This comes with a slight change in behaviour as
> pr_debug is configurable via CONFIG_DYNAMIC_DEBUG, whereas
> printk(KERN_DEBUG ...) is not.

--- a/drivers/tty/serial/8250/8250_pnp.c
> +++ b/drivers/tty/serial/8250/8250_pnp.c
> @@ -465,9 +465,9 @@ serial_pnp_probe(struct pnp_dev *dev, const
> struct pnp_device_id *dev_id)
>  		return -ENODEV;
>  
>  #ifdef SERIAL_DEBUG_PNP
> -	printk(KERN_DEBUG

I think it's not okay.

The rationale to have printk(KERN_DEBUG …) here is to allow a
compilation with support of those messages independently on
DYNAMIC_DEBUG.

If you want to switch to DYNAMIC_DEBUG you have to carefully check what
is done under SERIAL_DEBUG_PNP.

git grep on current linux-next shows that SERIAL_DEBUG_PNP is an
orphan.

So, I would suggest to remove #ifdef.

> -		"Setup PNP port: port %x, mem 0x%lx, irq %d, type
> %d\n",
> -		       uart.port.iobase, uart.port.mapbase,
> uart.port.irq, uart.port.iotype);
> +	pr_debug("Setup PNP port: port %x, mem 0x%lx, irq %d, type
> %d\n",
> +		 uart.port.iobase, uart.port.mapbase,
> +		 uart.port.irq, uart.port.iotype);
>  #endif
> 


-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy

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