linux-kernel - Re: [GIT PULL] Additional MM updates for 6.16-rc1

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Message-ID: <CAHk-=wgXTJo5G7e1cQxetFLbqbTUfP7Nfzt7-C89FjUHo1J9cA@mail.gmail.com>
Date: Tue, 10 Jun 2025 10:27:46 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>, SeongJae Park <sj@...nel.org>, 
	Honggyu Kim <honggyu.kim@...com>, linux-mm@...ck.org, mm-commits@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] Additional MM updates for 6.16-rc1

On Tue, 10 Jun 2025 at 09:41, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Just revert the commit?

Yes. We don't do "default y" for random features.

EVERY SINGLE DEVELOPER thinks that *their* feature is so important
that everybody else should enable it.

And if that feature wasn't enabled before, they are completely wrong
99% of the time.

There is a very real reason why 'default' defaults to 'n'.

So we do *not* use "default y" for features that aren't universal.

The only time we should use 'default y' is if some old feature that
used to be unconditional gets split up into a new Kconfig variable and
not using 'default y' means that people *lose* functionality.

Or if the feature is some critical security thing, or is some hardware
thing that has become so universal that you find it on basically every
single machine.

Or if that feature cures cancer or brings world peace.

Then you can enable it by default.

I have reverted that 'default y' thing, because I see no reason to
believe that DAEMON cures cancer.

               Linus