linux-kernel - Re: [PATCH 0/4] mm: Avoid sharing high VMA flag bits

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Message-ID: <aBoP9ILEv-z4bRAQ@finisterre.sirena.org.uk>
Date: Tue, 6 May 2025 22:34:44 +0900
From: Mark Brown <broonie@...nel.org>
To: Florent Revest <revest@...omium.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, catalin.marinas@....com, will@...nel.org,
	tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
	dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
	akpm@...ux-foundation.org, thiago.bauermann@...aro.org,
	jackmanb@...gle.com
Subject: Re: [PATCH 0/4] mm: Avoid sharing high VMA flag bits

On Tue, May 06, 2025 at 11:52:20AM +0200, Florent Revest wrote:

> While staring at include/linux/mm.h, I was wondering why VM_UFFD_MINOR and
> VM_SHADOW_STACK share the same bit on arm64. I think I gained enough confidence
> now to call it a bug.

Yes, it's a bug - it'll be an add/add conflict with those coming in via
different trees.

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