linux-kernel - Re: [PATCH v8 0/3] x86/earlyprintk: setup serial earlyprintk as early as possible

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Date:	Tue, 26 May 2015 19:20:02 +0600
From:	Alexander Kuleshov <kuleshovmail@...il.com>
To:	Borislav Petkov <bp@...e.de>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mark Rustad <mark.d.rustad@...el.com>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH v8 0/3] x86/earlyprintk: setup serial earlyprintk as early
 as possible

2015-05-26 19:17 GMT+06:00 Borislav Petkov <bp@...e.de>:
> On Tue, May 26, 2015 at 07:06:47PM +0600, Alexander Kuleshov wrote:
>> The early_printk function is usable only after the setup_early_printk will
>> be executed. We pass 'earlyprintk' through the kernel command line. So, it
>> means that earlyprintk will be usable only after the 'parse_early_param'
>> will be executed. We have usable earlyprintk only during early boot, kernel
>> decompression and after call of the 'parse_early_param'. This patchset makes
>> serial earlyprintk usable before the call of the 'parse_early_param'.
>
> ... and?
>
> Why do we need it usable before parse_early_param()? Use case?
>

To be able to use early_printk and serial console between kernel
decompression and
parse_eary_param.
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