linux-kernel - Re: [PATCH 1/2 v2] x86_64/earlyprintk: setup earlyprintk as early as possible

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Date:	Tue, 7 Apr 2015 17:47:00 +0600
From:	Alexander Kuleshov <kuleshovmail@...il.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	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 1/2 v2] x86_64/earlyprintk: setup earlyprintk as early as possible

2015-04-07 17:35 GMT+06:00 Ingo Molnar <mingo@...nel.org>:
>
>
> So if you set up earlyprintk via CONFIG_CMDLINE_OVERRIDE it just
> works?
>

Look, how i did it. I set:

CONFIG_CMDLINE_BOOL =y
CONFIG_CMDLINE_OVERRIDE =y

and passed following string:

[=root=/dev/sdb earlyprintk=ttyS0 loglevel=7 debug rdinit=/sbin/init
root=/dev/ram memblock=debug]

to the CONFIG_CMDLINE.

Now i put two early_printk calls before and after earlyprintk initialization:

    early_printk("before setup_early_printk \n");
    setup_early_printk(boot_command_line);
    early_printk("after setup_early_printk \n");

And i don't see first string, but see last.

Did i make something wrong?
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