From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sender4-pp-f112.zoho.com (sender4-pp-f112.zoho.com [136.143.188.112]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 032AF344D95; Thu, 7 May 2026 23:33:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=pass smtp.client-ip=136.143.188.112 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778196812; cv=pass; b=ZhJM1NNidh6gxpwP8gyO6vNmiwXvJMhSmPGCjJvn3Dq4kk5hcxukO4COuHi36nXCJHxBE0KlYkfe/q54qMdSAMfETwFDc9+0yI6sp1YtvvnnUBthduCFs5F09hJRbgd8BI4GRm3bNp0Pl5BGPOQbnbhCZXFadrUFv5sTCgeqsJQ= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778196812; c=relaxed/simple; bh=ryiwmubsMEvB81q0+2ze2r5daM4nZ4SezZ+kvrYnQcs=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=cqBcPUGDRa8FO/Z9zmlhw0maMp//sxSbGsGQb2Qc/uTNW2POaeUuDn10UceAEERcKClv3MlLXQsKMaE3om8ULBs3rcRwU1BCoTU+WnFiI8cP5L3epdxGSe9gKYniqPj0w/G0lDB/aWbkBLVNW04m8bVo3XdAOKRIyuZY4SRnQhw= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com; spf=pass smtp.mailfrom=collabora.com; dkim=pass (1024-bit key) header.d=collabora.com header.i=deborah.brouwer@collabora.com header.b=AnYlSpPC; arc=pass smtp.client-ip=136.143.188.112 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=collabora.com header.i=deborah.brouwer@collabora.com header.b="AnYlSpPC" ARC-Seal: i=1; a=rsa-sha256; t=1778196767; cv=none; d=zohomail.com; s=zohoarc; b=Z14Bj7DC4eNrGghUKaej8B9EyEr6aJlt54767kgVsjfSY+v2GDWo9k8q6FsodFpj4l9iPm5qQSZVX85Im/soanzyiLO6kJFvp6eO+VogOyV1Texfns6ZL641RrP8cKAI+dawYBoTeUbPChH4LCSt+DQkPgyDwr38LXPMJLhvC14= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1778196767; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:Subject:To:To:Message-Id:Reply-To; bh=2NLY72APnZcOWaicaOBiY0/NfOa0z6RzbN6RJkb//zI=; b=FPH9RnopzOOqgfTnfQDFSN4/2l7YcPTesrNrf1IeboROfmxihJYy2K7jvqm3l7bP7VZENSDv4qfWNB4ZZydkjMxmF5BIrnti+SJXTjSYfWppbS7AEpx6ipkoLjQ/x7Q3Uh3oygKhHGJ4u26vFnw7PJEACrNqYUFyGuwkunzWX7o= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=collabora.com; spf=pass smtp.mailfrom=deborah.brouwer@collabora.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1778196767; s=zohomail; d=collabora.com; i=deborah.brouwer@collabora.com; h=From:From:Date:Date:Subject:Subject:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id:Message-Id:References:In-Reply-To:To:To:Cc:Cc:Reply-To; bh=2NLY72APnZcOWaicaOBiY0/NfOa0z6RzbN6RJkb//zI=; b=AnYlSpPCYOmyvmVegZhccULOjc6A2OXwMe8xbCFeG38X/bF3Fqsg9Z+zs/a1YN1N NSFJP425GMy3csNmJRQWRhMwkpMZQ3mbCXX+CYg2LxAyoCBlD2LyL9QBbOgX22fqhhW ylHSREN/6DCqlyAqbkth3SlQD77kCVRf4yhGz+o4= Received: by mx.zohomail.com with SMTPS id 1778196765290540.1630003755475; Thu, 7 May 2026 16:32:45 -0700 (PDT) From: Deborah Brouwer Date: Thu, 07 May 2026 16:32:40 -0700 Subject: [PATCH 2/7] mm: rust: add VMA page offset helper Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260507-tyr-mmap-v1-2-eec048a23c25@collabora.com> References: <20260507-tyr-mmap-v1-0-eec048a23c25@collabora.com> In-Reply-To: <20260507-tyr-mmap-v1-0-eec048a23c25@collabora.com> To: Alice Ryhl , Lorenzo Stoakes , "Liam R. Howlett" , Miguel Ojeda , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Trevor Gross , Danilo Krummrich , David Airlie , Simona Vetter , Daniel Almeida Cc: linux-mm@kvack.org, rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, boris.brezillon@collabora.com, beata.michalska@arm.com, lyude@redhat.com, acourbot@nvidia.com, work@onurozkan.dev, alvin.sun@linux.dev, Laura Nao , Deborah Brouwer X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1487; i=deborah.brouwer@collabora.com; h=from:subject:message-id; bh=3UoXpSu7KF/dfK+s5Hc4A4XTkRi7kKOM3Xgjk6aPxIU=; b=owGbwMvMwCVWuULzOU9c7WvG02pJDJl/FSVdSlzlPubFRC68xhprNO/CTfev10TqDBInbAx60 H9OkiO9o5SFQYyLQVZMkeWsvVGPeNV7I935/5th5rAygQxh4OIUgImUVzD8FZp34dVrmzN7FnIl Sn4t2RFUFOJYHyPuGmgVquC370vJNYZ/moq8NZdWCZhl3TqZODlFv17+1YxLc3ZFbV9rlaV1/eI GBgA= X-Developer-Key: i=deborah.brouwer@collabora.com; a=openpgp; fpr=CD3F328C177AEF322D9FFF8379A829E70C5E7DEB From: Daniel Almeida Add VmaRef::pgoff() to expose vm_area_struct::vm_pgoff through the Rust VMA abstractions. vm_pgoff stores the mmap file offset in PAGE_SIZE units and can be used to distinguish different mmap regions and dispatch mmap or fault handling logic based on the requested offset. This matches the existing start()/end()/flags() helpers and avoids open-coded raw vm_area_struct access in Rust drivers. Signed-off-by: Daniel Almeida Signed-off-by: Deborah Brouwer --- rust/kernel/mm/virt.rs | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/rust/kernel/mm/virt.rs b/rust/kernel/mm/virt.rs index 63eb730b0b05..cb670e9d5fd9 100644 --- a/rust/kernel/mm/virt.rs +++ b/rust/kernel/mm/virt.rs @@ -92,6 +92,16 @@ pub fn end(&self) -> usize { unsafe { (*self.as_ptr()).__bindgen_anon_1.__bindgen_anon_1.vm_end } } + /// Returns the page offset of the virtual memory area. + /// + /// This is the offset in pages from the start of the file being mapped. + #[inline] + pub fn pgoff(&self) -> usize { + // SAFETY: By the type invariants, the caller holds at least the mmap read lock, so this + // access is not a data race. + unsafe { (*self.as_ptr()).vm_pgoff } + } + /// Zap pages in the given page range. /// /// This clears page table mappings for the range at the leaf level, leaving all other page -- 2.53.0