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

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Message-ID: <CANCZXo5VGoHR2RC3LN7+2MA_rrmr67Kz4_8km2oF__QJ54NLqQ@mail.gmail.com>
Date:	Thu, 28 May 2015 14:01:12 +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

2015-05-27 18:51 GMT+06:00 Borislav Petkov <bp@...e.de>:
> Now, have you tested this on real hardware? Because your 0/n message
> said "qemu" but I don't think that's sufficient. If we're going to
> enable early_printk this early, we'd need it working on real hardware
> too.
>
> For that I'd suggest adding a 4th, test patch which issues a couple of
> numbered early_printk() lines which we could run on a bunch of machines
> to see whether it actually works.

Thank you for suggestions. But how to do it? The patch already contains:

if (console_loglevel >= CONSOLE_LOGLEVEL_DEBUG)
      early_printk("Early printk is initialized\n");

But I've just noticesed that it does not print anything, because
console_loglevel can be CONSOLE_LOGLEVEL_DEBUG
only after parse_early_params too :) How to better be with it? To remove
if clause and just leave early_printk or something else?

Or you meant something else about patch for testing?
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