linux-kernel - Re: Shorten efi regions output

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Message-ID: <54AAA723.1070605@redhat.com>
Date:	Mon, 05 Jan 2015 16:00:51 +0100
From:	Laszlo Ersek <lersek@...hat.com>
To:	Matt Fleming <matt@...sole-pimps.org>,
	Borislav Petkov <bp@...en8.de>
CC:	Dave Young <dyoung@...hat.com>,
	linux-efi <linux-efi@...r.kernel.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: Shorten efi regions output

On 01/05/15 15:03, Matt Fleming wrote:
> On Wed, 10 Dec, at 11:46:28AM, Borislav Petkov wrote:
>> On Wed, Dec 10, 2014 at 10:17:41AM +0800, Dave Young wrote:
>>> I have same feeling with you, it is too long for most of people.
>>>
>>> Since the printk code are for EFI_DEBUG, they are around the #ifdef
>>> so I would like to see a kernel param like efi_debug=on, so only
>>> efi_debug is specified then these verbose messages are printed.
>>> Without the param kernel can print some basic infomation about the
>>> memory ranges.
>>>
>>> In arm64 code there's already a uefi_debug param it can be moved to
>>> general code so that there will be a goable switch.
>>
>> Hmm, makes sense to me. Maybe we should really hide those behind a
>> debug switch, the question is whether asking the user to boot with
>> "efi_debug=on" in order to see the regions is ok. And I think it is ok
>> because we do that when debugging other stuff so I don't see anything
>> different here.
>>
>> And then when they're disabled by default, we don't really need to
>> shorten them as they're pure debug output then.
>>
>> Matt?
> 
> I'm fine with disabling the EFI memory output regions by default.
> 
> Printing the regions is still useful for debugging, but like you
> mention, we frequently ask users to enable other debug options when
> tracking down issues.
> 
> Laszlo, would you be OK with that?

Sure.

Thanks
Laszlo

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