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Howlett" Subject: Re: [linux-next:master 5585/5731] error[E0277]: `*const kernel::bindings::vm_uffd_ops` cannot be shared between threads safely Message-ID: <2026031422-catsup-rectal-f886@gregkh> References: <202603121235.tpnRxFKO-lkp@intel.com> <20260313213638.GA147391@ax162> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 0ABF080003 X-Stat-Signature: 3g9tchcou66y1aabep95p987xhy7e38h X-Rspam-User: X-HE-Tag: 1773486779-296497 X-HE-Meta: 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 P9Wx7TAa fXYHg+wHC/pEl4GLku0igZDEpHYIZvKo+14T/YzpXPhld0GKKMzQLOU6E4Tub9RXZXsAGF7RghRfCPuVcuBfJgagxlSclLAzdcckk/YrRCQ4y/lyLotUHisB61N2DoMvjJV5F+uxhIn/V4Xk6xzaeh39K/p1jVAxTvmhBeFYZ+ZKvAUwXBilnrYVAQm2zM3g/Uazv2XCn97WNv0GEpQjlGKY8JMU36yqMs6jn+bBhSA4xC8F1ySL8YaSvHM5MAQfwKmzX9Xuqmxke2Hri3EksDqsmUECZnixgKNi0xawVZ2FAyz1f3iR/xAJeHOq9TfExCxArtgByc3HDEh6wX/5gVG8YBA9SGGWjflWaSzf+kZ5mbiaVZTbIJQ7ZpBG6qYQntdYeocH2sMi86wi0RlFjMOtHX+NkanrgNhScloJxPowJypXceZ9Pp+bEGWoLZa++MKy9Jf0DzOODxN+vgi86l14jO83XQypTI7WH8KWq2bggt4g= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Mar 13, 2026 at 11:39:14PM +0100, Miguel Ojeda wrote: > On Fri, Mar 13, 2026 at 10:36 PM Nathan Chancellor wrote: > > > > It looks like this is a conflict between Alice's "rust_binder: check ownership > > before using vma" [1] (currently in char-misc-linus [2]) and Mike's > > "userfaultfd: introduce vm_uffd_ops" [3] (currently in mm-unstable [4]), > > hence why it was bisected to the -next merge commit. > > Thanks Nathan, yeah, adding a raw pointer (not function pointer) to > the struct makes the type `!Sync` in Rust. > > I assume this is best handled with a patch on top of char-misc-linus. > Perhaps creating a wrapper to assert it is `Sync`, since the > `BINDER_VM_OPS` contents are unused (so far). > > Cc'ing more folks related to the commit. char-misc-linus should get merged into Linus's tree "soon" and then we can fix up the mm-unstable change for this. thanks, greg k-h