linux-kernel - Re: [PATCH v2 1/4] mm: convert FPB_IGNORE_* into FPB_RESPECT

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 for Android: free password hash cracker in your pocket

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

Message-ID: <460a0098-34ec-4ed4-8469-67b0f8a602d5@arm.com>
Date: Thu, 3 Jul 2025 15:35:21 +0530
From: Dev Jain <dev.jain@....com>
To: David Hildenbrand <david@...hat.com>, linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Vlastimil Babka <vbabka@...e.cz>, Jann Horn <jannh@...gle.com>,
 Mike Rapoport <rppt@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>,
 Michal Hocko <mhocko@...e.com>, Zi Yan <ziy@...dia.com>,
 Matthew Brost <matthew.brost@...el.com>,
 Joshua Hahn <joshua.hahnjy@...il.com>, Rakie Kim <rakie.kim@...com>,
 Byungchul Park <byungchul@...com>, Gregory Price <gourry@...rry.net>,
 Ying Huang <ying.huang@...ux.alibaba.com>,
 Alistair Popple <apopple@...dia.com>, Pedro Falcato <pfalcato@...e.de>,
 Rik van Riel <riel@...riel.com>, Harry Yoo <harry.yoo@...cle.com>,
 Lance Yang <ioworker0@...il.com>, Oscar Salvador <osalvador@...e.de>,
 Lance Yang <lance.yang@...ux.dev>
Subject: Re: [PATCH v2 1/4] mm: convert FPB_IGNORE_* into FPB_RESPECT_*

On 02/07/25 4:19 pm, David Hildenbrand wrote:
> Respecting these PTE bits is the exception, so let's invert the meaning.
>
> With this change, most callers don't have to pass any flags. This is
> a preparation for splitting folio_pte_batch() into a non-inlined
> variant that doesn't consume any flags.
>
> Long-term, we want folio_pte_batch() to probably ignore most common
> PTE bits (e.g., write/dirty/young/soft-dirty) that are not relevant for
> most page table walkers: uffd-wp and protnone might be bits to consider in
> the future. Only walkers that care about them can opt-in to respect them.
>
> No functional change intended.
>
> Reviewed-by: Lance Yang <lance.yang@...ux.dev>
> Reviewed-by: Zi Yan <ziy@...dia.com>
> Reviewed-by: Oscar Salvador <osalvador@...e.de>
> Signed-off-by: David Hildenbrand <david@...hat.com>
> ---
>   

Reviewed-by: Dev Jain <dev.jain@....com>