linux-kernel - Re: [PATCH] serial: MMIO32 support for 8250

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Message-Id: <20100628134426.0558ac67.akpm@linux-foundation.org>
Date:	Mon, 28 Jun 2010 13:44:26 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Samium Gromoff <_deepfire@...lingofgreen.ru>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: MMIO32 support for 8250_early.c

On Wed, 23 Jun 2010 23:10:20 +0400
Samium Gromoff <_deepfire@...lingofgreen.ru> wrote:

> This should be fairly uncontroversial, but YMMV.
> 
> Available from master branch at git://git.feelingofgreen.ru/linux
> 
> commit 67e21ada6739e0730fb28f855abf4202a1bb3f8c
> Author: Samium Gromoff <deepfire@...ees.com>
> Date:   Thu Jun 24 00:36:16 2010 +0400
> 
>     Provide MMIO32 support in 8250_early (aka earlycon)

Please update Documentation/kernel-parameters.txt.

> ...
>
> @@ -182,9 +199,9 @@ static int __init parse_options(struct early_serial8250_device *device,
>  	}
>  
>  	printk(KERN_INFO "Early serial console at %s 0x%llx (options '%s')\n",
> -		mmio ? "MMIO" : "I/O port",
> -		mmio ? (unsigned long long) port->mapbase
> -		     : (unsigned long long) port->iobase,
> +		mmio ? "MMIO" : mmio32 ? "MMIO32" : "I/O port",
> +		(mmio | mmio32) ? (unsigned long long) port->mapbase
> +		                : (unsigned long long) port->iobase,
>  		device->options);

That printk has just got out of control.  We should at the very least
parenthesise that ?:?: thing before someone sees it and dies.  Or just
rip it up and reimplement it.  Note that mapbase can be printed with %p
and iobase with %pr, but the code munges them both into ull's and uses
%llx.

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