linux-kernel - Re: [PATCH] x86,setup: add serial_console_port_base in boot

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Message-ID: <4C55041C.1030008@kernel.org>
Date:	Sat, 31 Jul 2010 22:20:28 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Pekka Enberg <penberg@...helsinki.fi>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kexec@...ts.infradead.org
Subject: Re: [PATCH] x86,setup: add serial_console_port_base in boot_params

On 07/31/2010 07:42 PM, Eric W. Biederman wrote:
> Yinghai Lu <yinghai@...nel.org> writes:
> 
>> On 07/31/2010 02:02 PM, H. Peter Anvin wrote:
>>> On 07/31/2010 11:32 AM, Cyrill Gorcunov wrote:
>>>>>
>>>>> No, this is the internal part of the boot protocol, so it's not an issue.
>>>>>
>>>>
>>>> Peter, I didn't mean any issue here, I meant that bootloaders don't know about
>>>> this field yet and they will have to update own sources to pass port value
>>>> at proper place of boot params. Or I miss something?
>>>>
>>>
>>> Boot loaders that use the 16-bit entry point are unaffected.
>>>
>>> Boot loaders which use the 32-bit entry point but properly clears the
>>> zero page simply will not have the feature.
>>>
>>> Boot loaders which use the 32-bit entry point but doesn't clear the zero
>>> page are broken.
>>>
>> can you if this one is right for kexec path?
> 
> I am walking out the door, but this seems like nonsense to me.
> 
> Further I don't see why we would add something to the zero page
> when we have a perfectly good way to pass this information via
> the kernel command line.  strstr and strtoul are trivial little
> functions so I don't see why anything would need to parse anything
> other than console= or early_printk=.  The difference in code size
> is negligible.
> 
so you prefer to check command line for console info in arch/x86/boot/compressed/misc.c again?

that commandline is analyzed in arch/x86/boot/tty.c already.

Yinghai
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