linux-kernel - Re: [PATCH] x86/earlyprintk: setup earlyprintk as early as possible

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Message-ID: <CAE9FiQXB=tGvnNR7BoKbDzU9-zRkV444cjGSYypPmwgQ4HLNSA@mail.gmail.com>
Date:	Tue, 7 Apr 2015 12:08:29 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Alexander Kuleshov <kuleshovmail@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/earlyprintk: setup earlyprintk as early as possible

On Tue, Apr 7, 2015 at 12:07 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> On Tue, Apr 7, 2015 at 3:31 AM, Alexander Kuleshov
> <kuleshovmail@...il.com> wrote:
>
>>
>> As i already wrote, i tested it for x86_64 and it works. I will put earlyprintk
>> setup in the start of the i386_start_kernel, will test it with 32-bit
>> and resend two
>> patches if they will be good.
>
> No, that is not enough.
> early_printk would handle not only serial console with io port accessing.
> You need to make sure all other path including pciserial/dbgp/efi is safe.
> They are using early_ioremap, and you can not call early_ioremap()
> before early_ioremap.

They are using early_ioremap, and you can not call early_ioremap()
before early_ioremap_init.

>
> otherwise you may need to just search "serial string in boot command line" like
> i did in moving earlycon early patch.
>
>     Yinghai
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