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

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Message-ID: <20140424104540.GA5834@gmail.com>
Date:	Thu, 24 Apr 2014 12:45:40 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Dave Young <dyoung@...hat.com>
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


* 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().

Thanks,

	Ingo
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