linux-kernel - Re: [PATCH 2/3] arm64: use core efi=debug instead of uefi

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Message-ID: <CAKv+Gu8vkHaqkOrJpiQweczj1zzNh4sGfM4ySFJ7qiwDM5u_4A@mail.gmail.com>
Date:	Wed, 26 Aug 2015 20:29:27 +0200
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	Leif Lindholm <leif.lindholm@...aro.org>
Cc:	Matt Fleming <matt@...eblueprint.co.uk>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Mark Salter <msalter@...hat.com>
Subject: Re: [PATCH 2/3] arm64: use core efi=debug instead of uefi_debug
 command line parameter

On 26 August 2015 at 19:30, Leif Lindholm <leif.lindholm@...aro.org> wrote:
> On Wed, Aug 26, 2015 at 06:24:55PM +0100, Matt Fleming wrote:
>> On Wed, 26 Aug, at 02:24:57PM, Leif Lindholm wrote:
>> > Now that we have an efi=debug command line option in the core code, use
>> > this instead of the arm64-specific uefi_debug option.
>> >
>> > Signed-off-by: Leif Lindholm <leif.lindholm@...aro.org>
>> > ---
>> >  Documentation/arm/uefi.txt |  2 --
>> >  arch/arm64/kernel/efi.c    | 19 +++++--------------
>> >  2 files changed, 5 insertions(+), 16 deletions(-)
>>
>> Are there no concerns with backwards-compatibility here? I expected
>> this patch to internally convert uefi_debug to efi=debug if old boot
>> loaders, kernel config, etc specify it.
>>
>> Is that something that can be safely ignored?
>
> Since it is purely a debug feature, I opted to just drop it.
> I don't have strong feelings, and it could certainly be kept as an
> arm64-only alias (but setting the EFI_DBG flag) if others disagree.
>

Let's not bother. This is strictly a debug option that only affects
what gets printed to the kernel log, which itself is not (or should
not be) an ABI. Also, if anyone cares deeply about always having the
feature enabled both on before and after kernels, they can always pass
both options.

-- 
Ard.
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