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

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Message-ID: <CANCZXo5JT95XK9wGgsumDTcpGSEMw+-nuDz7kd-9_wbJ=ERX+g@mail.gmail.com>
Date:	Wed, 27 May 2015 13:33:23 +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

Hello Borislav,

2015-05-27 3:34 GMT+06:00 Borislav Petkov <bp@...e.de>:
> On Tue, May 26, 2015 at 08:11:07PM +0600, Alexander Kuleshov wrote:
>> It is not "just because we can". There is some code after kernel
>> decompression and before parse_early_param and earlyprintk can be
>> useful for printing debugging information in this case.
>
> Which code? Please show me.
>
> Because *that* would be a use case.

We can't use earlyprintk from the arch/x86/kernel/head{32,64}.c before
parse_early_param from the
arch/x86/kernel/setup.c. But I think you know it better than me. So I
can't understand what's wrong
here, maybe you will give me explanation. I'm very appricate it.

Thank you.
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