linux-kernel - Re: [PATCH] ignore ,keep for efi earlyprintk

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Date:	Fri, 25 Apr 2014 09:53:54 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	matt.fleming@...el.com, hpa@...or.com, akpm@...ux-foundation.org,
	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ignore ,keep for efi earlyprintk

On 04/24/14 at 12:45pm, Ingo Molnar wrote:
> 
> * Dave Young <dyoung@...hat.com> wrote:
> 
> > earlyprint=efi,keep results a kernel hang after "Freeing unused kernel memory"
> 
> That's a bug.
> 
> > 
> > Actually efi earlyprintk is using __init functions such as early_ioremap etc.
> > Thus efi earlyconsole can not be kept.
> > 
> > So just ignore it and give out a warning to user.
> 
> So, bugs should be fixed, not worked around.
> 
> earlyprintk=,keep is really useful for the occasional difficult low 
> level bug in the printk code or similar, because earlyprintk is a 
> completely separate code path from printk().

I thought that earlyprintk is just for debugging before real console is available.
But it does help debugging printk as you said.

Will think about how to fix it.

Thanks
Dave
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