linux-kernel - Re: [GIT PULL] slab fix for 6.18-rc7

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Message-ID: <CAHk-=wi-y+euEWAM9=Ns_kTXTABkwR0_MBPXf5iq5uuxfadVSQ@mail.gmail.com>
Date: Thu, 20 Nov 2025 13:55:51 -0800
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Matthew Wilcox <willy@...radead.org>
Cc: Vlastimil Babka <vbabka@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>, 
	Harry Yoo <harry.yoo@...cle.com>, David Rientjes <rientjes@...gle.com>, 
	Christoph Lameter <cl@...two.org>, Roman Gushchin <roman.gushchin@...ux.dev>, 
	"linux-mm@...ck.org" <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>, 
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [GIT PULL] slab fix for 6.18-rc7

On Thu, 20 Nov 2025 at 13:37, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> HIGHMEM was a mistake forced on us by bad hardware. We should revel in
> the fact that it is not really relevant any more.

Btw. there are probably many other cases where we might just say "this
makes no sense in HIGHMEM".

But most of the time, it's not worth actively removing support for it
- it's just more work.

But when there's a case like this mempool debug thing, just say "we
don't care about this debug feature for HIGHMEM" rather than trying to
actually deal with it.

IOW, just don't write extra code for it.

          Linus