linux-kernel - Re: [PATCH RESEND 00/12] mm: add bitmap VMA flag helpers and convert all mmap

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: <20260119231443.GT1134360@nvidia.com>
Date: Mon, 19 Jan 2026 19:14:43 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Jarkko Sakkinen <jarkko@...nel.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Thomas Gleixner <tglx@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>, x86@...nel.org,
	"H . Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Tvrtko Ursulin <tursulin@...ulin.net>,
	Christian Koenig <christian.koenig@....com>,
	Huang Rui <ray.huang@....com>,
	Matthew Auld <matthew.auld@...el.com>,
	Matthew Brost <matthew.brost@...el.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
	Benjamin LaHaise <bcrl@...ck.org>, Gao Xiang <xiang@...nel.org>,
	Chao Yu <chao@...nel.org>, Yue Hu <zbestahu@...il.com>,
	Jeffle Xu <jefflexu@...ux.alibaba.com>,
	Sandeep Dhavale <dhavale@...gle.com>,
	Hongbo Li <lihongbo22@...wei.com>,
	Chunhai Guo <guochunhai@...o.com>, Theodore Ts'o <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	Muchun Song <muchun.song@...ux.dev>,
	Oscar Salvador <osalvador@...e.de>,
	David Hildenbrand <david@...nel.org>,
	Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
	Mike Marshall <hubcap@...ibond.com>,
	Martin Brandenburg <martin@...ibond.com>,
	Tony Luck <tony.luck@...el.com>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Dave Martin <Dave.Martin@....com>,
	James Morse <james.morse@....com>, Babu Moger <babu.moger@....com>,
	Carlos Maiolino <cem@...nel.org>,
	Damien Le Moal <dlemoal@...nel.org>,
	Naohiro Aota <naohiro.aota@....com>,
	Johannes Thumshirn <jth@...nel.org>,
	Matthew Wilcox <willy@...radead.org>,
	"Liam R . Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>, Hugh Dickins <hughd@...gle.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	Zi Yan <ziy@...dia.com>, Nico Pache <npache@...hat.com>,
	Ryan Roberts <ryan.roberts@....com>, Dev Jain <dev.jain@....com>,
	Barry Song <baohua@...nel.org>, Lance Yang <lance.yang@...ux.dev>,
	Jann Horn <jannh@...gle.com>, Pedro Falcato <pfalcato@...e.de>,
	David Howells <dhowells@...hat.com>,
	Paul Moore <paul@...l-moore.com>, James Morris <jmorris@...ei.org>,
	"Serge E . Hallyn" <serge@...lyn.com>,
	Yury Norov <yury.norov@...il.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	linux-sgx@...r.kernel.org, linux-kernel@...r.kernel.org,
	nvdimm@...ts.linux.dev, linux-cxl@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
	linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
	linux-erofs@...ts.ozlabs.org, linux-ext4@...r.kernel.org,
	linux-mm@...ck.org, ntfs3@...ts.linux.dev, devel@...ts.orangefs.org,
	linux-xfs@...r.kernel.org, keyrings@...r.kernel.org,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCH RESEND 00/12] mm: add bitmap VMA flag helpers and convert
 all mmap_prepare to use them

On Mon, Jan 19, 2026 at 09:19:02PM +0000, Lorenzo Stoakes wrote:
> We introduced the bitmap VMA type vma_flags_t in the aptly named commit
> 9ea35a25d51b ("mm: introduce VMA flags bitmap type") in order to permit
> future growth in VMA flags and to prevent the asinine requirement that VMA
> flags be available to 64-bit kernels only if they happened to use a bit
> number about 32-bits.
> 
> This is a long-term project as there are very many users of VMA flags
> within the kernel that need to be updated in order to utilise this new
> type.
> 
> In order to further this aim, this series adds a number of helper functions
> to enable ordinary interactions with VMA flags - that is testing, setting
> and clearing them.
> 
> In order to make working with VMA bit numbers less cumbersome this series
> introduces the mk_vma_flags() helper macro which generates a vma_flags_t
> from a variadic parameter list, e.g.:
> 
> 	vma_flags_t flags = mk_vma_flags(VMA_READ_BIT, VMA_WRITE_BIT,
> 					 VMA_EXEC_BIT);

I didn't try to check every conversion, but the whole approach looks
nice to me and I think this design is ergonomic!

Jason