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

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Message-Id: <20250610173228.49109-1-sj@kernel.org>
Date: Tue, 10 Jun 2025 10:32:28 -0700
From: SeongJae Park <sj@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: SeongJae Park <sj@...nel.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Andrew Morton <akpm@...ux-foundation.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 10:27:46 -0700 Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> 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.

Makes sense, and thank you for explaining these all.  I will keep thse in my
mind to avoid making same mistakes in future.


Thanks,
SJ

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