linux-kernel - Re: [PATCH 1/2] huge_mm.h: is_huge_zero

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAKPOu+9wz9g0VuYDPiNDYdaGG-gdK86h1gGSCmVPsC2a5f-GPA@mail.gmail.com>
Date: Wed, 27 Aug 2025 06:39:05 +0200
From: Max Kellermann <max.kellermann@...os.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: david@...hat.com, lorenzo.stoakes@...cle.com, ziy@...dia.com, 
	baolin.wang@...ux.alibaba.com, Liam.Howlett@...cle.com, npache@...hat.com, 
	ryan.roberts@....com, dev.jain@....com, baohua@...nel.org, 
	shikemeng@...weicloud.com, kasong@...cent.com, nphamcs@...il.com, 
	bhe@...hat.com, chrisl@...nel.org, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] huge_mm.h: is_huge_zero_folio(NULL) should return false

On Wed, Aug 27, 2025 at 3:55 AM Andrew Morton <akpm@...ux-foundation.org> wrote:
> Isn't it a bug to call is_huge_zero_folio() before the huge_zero_folio
> has been created?

I have no idea, but folios_put_refs() calls it and I don't see why it
shouldn't be allowed to do that. What else should folios_put_refs()
do?

(Thanks Zi Yan, I'll send v2 with your suggestions.)