linux-kernel - Re: [PATCH v2 1/4] mm: declare VMA flags by bit

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: <e98d913e-71bc-4b58-95ec-8ae054c43120@lucifer.local>
Date: Fri, 14 Nov 2025 13:55:48 +0000
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
        Muchun Song <muchun.song@...ux.dev>,
        Oscar Salvador <osalvador@...e.de>,
        David Hildenbrand <david@...hat.com>,
        "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>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Yuanchu Xie <yuanchu@...gle.com>, Wei Xu <weixugc@...gle.com>,
        Peter Xu <peterx@...hat.com>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>,
        Mel Gorman <mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>,
        Kees Cook <kees@...nel.org>, Matthew Wilcox <willy@...radead.org>,
        Jason Gunthorpe <jgg@...pe.ca>, John Hubbard <jhubbard@...dia.com>,
        Leon Romanovsky <leon@...nel.org>, Zi Yan <ziy@...dia.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.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>, Xu Xin <xu.xin16@....com.cn>,
        Chengming Zhou <chengming.zhou@...ux.dev>,
        Jann Horn <jannh@...gle.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>,
        Shakeel Butt <shakeel.butt@...ux.dev>,
        David Rientjes <rientjes@...gle.com>, Rik van Riel <riel@...riel.com>,
        Harry Yoo <harry.yoo@...cle.com>,
        Kemeng Shi <shikemeng@...weicloud.com>,
        Kairui Song <kasong@...cent.com>, Nhat Pham <nphamcs@...il.com>,
        Baoquan He <bhe@...hat.com>, Chris Li <chrisl@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Qi Zheng <zhengqi.arch@...edance.com>, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Bjorn Roy Baron <bjorn3_gh@...tonmail.com>,
        Benno Lossin <lossin@...nel.org>,
        Andreas Hindborg <a.hindborg@...nel.org>,
        Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>,
        rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v2 1/4] mm: declare VMA flags by bit

On Fri, Nov 14, 2025 at 01:50:45PM +0000, Alice Ryhl wrote:
> On Fri, Nov 14, 2025 at 01:26:08PM +0000, Lorenzo Stoakes wrote:
> > diff --git a/rust/bindings/bindings_helper.h b/rust/bindings/bindings_helper.h
> > index 2e43c66635a2..4c327db01ca0 100644
> > --- a/rust/bindings/bindings_helper.h
> > +++ b/rust/bindings/bindings_helper.h
> > @@ -108,7 +108,32 @@ const xa_mark_t RUST_CONST_HELPER_XA_PRESENT = XA_PRESENT;
> >
> >  const gfp_t RUST_CONST_HELPER_XA_FLAGS_ALLOC = XA_FLAGS_ALLOC;
> >  const gfp_t RUST_CONST_HELPER_XA_FLAGS_ALLOC1 = XA_FLAGS_ALLOC1;
> > +
> >  const vm_flags_t RUST_CONST_HELPER_VM_MERGEABLE = VM_MERGEABLE;
> > +const vm_flags_t RUST_CONST_HELPER_VM_READ = VM_READ;
> > +const vm_flags_t RUST_CONST_HELPER_VM_WRITE = VM_WRITE;
> > +const vm_flags_t RUST_CONST_HELPER_VM_EXEC = VM_EXEC;
> > +const vm_flags_t RUST_CONST_HELPER_VM_SHARED = VM_SHARED;
> > +const vm_flags_t RUST_CONST_HELPER_VM_MAYREAD = VM_MAYREAD;
> > +const vm_flags_t RUST_CONST_HELPER_VM_MAYWRITE = VM_MAYWRITE;
> > +const vm_flags_t RUST_CONST_HELPER_VM_MAYEXEC = VM_MAYEXEC;
> > +const vm_flags_t RUST_CONST_HELPER_VM_MAYSHARE = VM_MAYEXEC;
> > +const vm_flags_t RUST_CONST_HELPER_VM_PFNMAP = VM_PFNMAP;
> > +const vm_flags_t RUST_CONST_HELPER_VM_IO = VM_IO;
> > +const vm_flags_t RUST_CONST_HELPER_VM_DONTCOPY = VM_DONTCOPY;
> > +const vm_flags_t RUST_CONST_HELPER_VM_DONTEXPAND = VM_DONTEXPAND;
> > +const vm_flags_t RUST_CONST_HELPER_VM_LOCKONFAULT = VM_LOCKONFAULT;
> > +const vm_flags_t RUST_CONST_HELPER_VM_ACCOUNT = VM_ACCOUNT;
> > +const vm_flags_t RUST_CONST_HELPER_VM_NORESERVE = VM_NORESERVE;
> > +const vm_flags_t RUST_CONST_HELPER_VM_HUGETLB = VM_HUGETLB;
> > +const vm_flags_t RUST_CONST_HELPER_VM_SYNC = VM_SYNC;
> > +const vm_flags_t RUST_CONST_HELPER_VM_ARCH_1 = VM_ARCH_1;
> > +const vm_flags_t RUST_CONST_HELPER_VM_WIPEONFORK = VM_WIPEONFORK;
> > +const vm_flags_t RUST_CONST_HELPER_VM_DONTDUMP = VM_DONTDUMP;
> > +const vm_flags_t RUST_CONST_HELPER_VM_SOFTDIRTY = VM_SOFTDIRTY;
> > +const vm_flags_t RUST_CONST_HELPER_VM_MIXEDMAP = VM_MIXEDMAP;
> > +const vm_flags_t RUST_CONST_HELPER_VM_HUGEPAGE = VM_HUGEPAGE;
> > +const vm_flags_t RUST_CONST_HELPER_VM_NOHUGEPAGE = VM_NOHUGEPAGE;
>
> I got this error:
>
> error[E0428]: the name `VM_SOFTDIRTY` is defined multiple times
>       --> rust/bindings/bindings_generated.rs:115967:1
>        |
> 13440  | pub const VM_SOFTDIRTY: u32 = 0;
>        | -------------------------------- previous definition of the value `VM_SOFTDIRTY` here
> ...
> 115967 | pub const VM_SOFTDIRTY: vm_flags_t = 0;
>        | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `VM_SOFTDIRTY` redefined here
>        |
>        = note: `VM_SOFTDIRTY` must be defined only once in the value namespace of this module
>

That's odd, obviously I build tested this and didn't get the same error.

Be good to know what config options to enable for testing for rust. I repro'd
the previously reported issues, and new ones since I'm now declaring these
values consistently using BIT().

But in my build locally, no errors with LLVM=1 and CONFIG_RUST=y.

> Please add the constants in rust/bindgen_parameters next to
> ARCH_KMALLOC_MINALIGN to avoid this error. This ensures that only the
> version from bindings_helper.h is generated.

As in

--block-list-item <VM_blah> for every flag?

>
> Alice

Thanks, Lorenzo