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1D9/0FzIMjgaFlu5EBKdsE+1xHdvCq2MNI2sMgwIjYKyO+b0uSEt+Uil0NWjYHQcSvOPgtIfzipxdRjsX29W3HRjzr5/vjIOuwbqQvNy9eoTSUsXZqksjHOA1CNLJZi121aCXEWJNPsTFwmIwrQzMzhinQdcXbgjcFnKP4vb97Aur0RBRKpFlF4Kpq0PyXpnNY8zrl6WF9kYbdmWbwYpbmDOT9xT7VeAzD6eRvZiap1PND+GS1VXIX+aL/wy7guUAdkVeGUrlcLmDSjV6M5PCFPYGFqthdkpveOUahdQjt9RoXJhjo3bKeeoWu4PiWBN5EU1mMwYoK4YYxh90RGRqFyJ5IASsr7D33HWPI7u3QHMfZQoeX1ldQBx2eeKldOOH4LWZe5CN/8qFpTnMEuSq+FPkXvthgjwMRStEqf4gkxqnGghhw4k8M6tUqFZ9A1lKNJcH8InrYM4sVYYCQYF9yBAP6q8Y/aQb3Y7JAhOGs7ZVP+Y= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue Aug 25, 2026 at 2:20 PM BST, Alice Ryhl wrote: > On Mon, Aug 24, 2026 at 01:17:56PM +0200, Andreas Hindborg wrote: >> + // SAFETY: We just successfully allocated a page, so we now hav= e ownership of the newly >> + // allocated page. We transfer that ownership to the new `Owned= ` object. >> + // Since `Page` is transparent, we can cast the pointer directl= y. >> + Ok(unsafe { Owned::from_raw(page.cast()) }) > > This doesn't satisfy the safety requirements of Owned::from_raw() > because the page may be used with vm_insert_page(), which increments its > refcount and causes it to be shared the vma system, and this occurs > before Page::release() is called. I suppose the existing vm_insert_page() abstraction we have is already problematic, because it uses `&Page`? Maybe we want to change the API to use `ARef` so it already has to be shared? Conceptually it takes a reference count from a `&Page`, which isn't possible because `Page` is not `AlwaysRefCounted`, so it needs a `&ARef` to be able to do that op. Best, Gary