linux-kernel - Re: kms in defconfig

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Message-ID: <20090427083935.GA20941@elte.hu>
Date:	Mon, 27 Apr 2009 10:39:35 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Dave Airlie <airlied@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: kms in defconfig

* Dave Airlie <airlied@...il.com> wrote:

> Hi guys,
> 
> I just noticed CONFIG_DRM_I915_KMS is enabled for x86-64.
> 
> This should never be the case, as anyone who built defconfig 
> kernels before, will now get KMS enabled when really they need to 
> have done userspace upgrades.

I've yet to see such a bugreport.

But i dont have particularly strong feelings about defconfigs: less 
than 1% of all kernel developers use them - which transforms into 
less than 0.01% of all Linux users.

KMS is off by default in 'make oldconfig', right? That's all that 
matters really.

defconfigs _do_ change and there was never a compatibility rule for 
defconfigs. Arch defconfig is more of a signal towards what the 
architecture maintainers consider sane and supportable (or 
desirable) defaults - and it is also what developers working on 
arch/x86 should consider as the main thrust of features.

> KMS should default to n in the upstream kernel, for at least 4-5 
> years.

That's an extremely long period of migration. I also think it's 
unreasonable: we dont want to draw out the migration from 
DRI1+user-space-mode-setting to DRI2+KMS that long. KMS should have 
been implemented and made the default 4-5 years _ago_ i think.

KMS is the sane design for graphics and i'd go as far as to consider 
user-space mode setting an outright _bug_. It look a long time to 
fix but now lets look forward and fix all the bugs in KMS, ASAP ...

	Ingo
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