linux-kernel - Re: [PATCH v1 3/4] mm/rmap: fix two comments related to huge_pmd

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] [day] [month] [year] [list]

Message-ID: <aTpZy-_A-aFxpdn5@localhost.localdomain>
Date: Thu, 11 Dec 2025 06:42:35 +0100
From: Oscar Salvador <osalvador@...e.de>
To: "David Hildenbrand (Red Hat)" <david@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-mm@...ck.org, Will Deacon <will@...nel.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <npiggin@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnd Bergmann <arnd@...db.de>, Muchun Song <muchun.song@...ux.dev>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>, Jann Horn <jannh@...gle.com>,
	Pedro Falcato <pfalcato@...e.de>, Rik van Riel <riel@...riel.com>,
	Harry Yoo <harry.yoo@...cle.com>,
	Laurence Oberman <loberman@...hat.com>,
	Prakash Sangappa <prakash.sangappa@...cle.com>,
	Nadav Amit <nadav.amit@...il.com>,
	Liu Shixin <liushixin2@...wei.com>
Subject: Re: [PATCH v1 3/4] mm/rmap: fix two comments related to
 huge_pmd_unshare()

On Fri, Dec 05, 2025 at 10:35:57PM +0100, David Hildenbrand (Red Hat) wrote:
> PMD page table unsharing no longer touches the refcount of a PMD page
> table. Also, it is not about dropping the refcount of a "PMD page" but
> the "PMD page table".
> 
> Let's just simplify by saying that the PMD page table was unmapped,
> consequently also unmapping the folio that was mapped into this page.
> 
> This code should be deduplicated in the future.
> 
> Fixes: 59d9094df3d7 ("mm: hugetlb: independent PMD page table shared count")
> Cc: Liu Shixin <liushixin2@...wei.com>
> Signed-off-by: David Hildenbrand (Red Hat) <david@...nel.org>

Acked-by: Oscar Salvador <osalvador@...e.de>

 

-- 
Oscar Salvador
SUSE Labs