From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 2C8911F7569; Wed, 25 Mar 2026 00:39:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774399173; cv=none; b=gOupWrXdcG19+E2XI+BUVmFMiIN/ysCcu4FGD7yKjM7FRneFU3yYnS8kc0U4AnwQtOYrGUSJQHWES6NCwKWN0P/HIBCmCiN9f89KTVhysTjn3uMeLOFRy8JbppCmNkKUfDcLY8KCHNZ2Ym7dW+N/dxi45I82S8mf+bnA8sTKbs0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774399173; c=relaxed/simple; bh=+mTb7igADfQv5dHN/X3TmqsYTOT3vg9UdFFcQL8Vmco=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=C4UELMsXBYOLh7g9LkfI3LwO0iw5He/sZubGG3oCwJxRtAzuwHfttxWPGRIAGVsG8MWLVXpbld5UBpTnfIji+5MyeQCTf7h02bs1oZTpuppsqYtk5sFoSDIL8u4kfgkv+Qm7vB0tKo2aEAthu4+Q6Wz+0m7JV3HagSQt2WbUtoo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=I36ewqRd; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="I36ewqRd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 20FB8C19424; Wed, 25 Mar 2026 00:39:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774399172; bh=+mTb7igADfQv5dHN/X3TmqsYTOT3vg9UdFFcQL8Vmco=; h=From:To:Cc:Subject:Date:From; b=I36ewqRdAS4Qczc8+Xl1aqOZOcf+kdLzZrIocpHb4SHux8H+QeqLgwbQbLYHFpdtN o5WobSL9tQO9tAbob0GBp3UHo7Wa53spMTxbA1NMZMLqjamQuTTovBuGIqzZNkJDCj zfW7CIhX+EkmIWzneiYSlzuFyaUXeBsS0KJZEUvLVjea+YpE4w61CwIRqde84GNUkk tAZYa9M2t3pZxqgC0wzDpNljxD8eyul8hStBkSjtP5ZVUSkZZGCSywuvERPIWqawl8 OUjuuc8XdlmTh+tFru/pISEj9pMOpUhN9leDTnag5i/umemdIrggXhN8vy1MjMbkP4 cOzHDkV7EWtoQ== From: Danilo Krummrich To: acourbot@nvidia.com, aliceryhl@google.com, abdiel.janulgue@gmail.com, daniel.almeida@collabora.com, robin.murphy@arm.com, a.hindborg@kernel.org, ojeda@kernel.org, boqun@kernel.org, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, tmgross@umich.edu, ttabi@nvidia.com Cc: nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, driver-core@lists.linux.dev, rust-for-linux@vger.kernel.org, Danilo Krummrich Subject: [PATCH 1/3] rust: uaccess: generalize write_dma() to accept any Coherent Date: Wed, 25 Mar 2026 01:39:15 +0100 Message-ID: <20260325003921.3420-1-dakr@kernel.org> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: driver-core@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Generalize write_dma() from &Coherent<[u8]> to &Coherent where T: KnownSize + AsBytes + ?Sized. The function body only uses as_ptr() and size(), which work for any such T, so there is no reason to restrict it to byte slices. Signed-off-by: Danilo Krummrich --- rust/kernel/uaccess.rs | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/rust/kernel/uaccess.rs b/rust/kernel/uaccess.rs index e26ef90ba8ad..6c9c1cce3c63 100644 --- a/rust/kernel/uaccess.rs +++ b/rust/kernel/uaccess.rs @@ -12,6 +12,7 @@ ffi::{c_char, c_void}, fs::file, prelude::*, + ptr::KnownSize, transmute::{AsBytes, FromBytes}, }; use core::mem::{size_of, MaybeUninit}; @@ -524,7 +525,12 @@ pub fn write_slice(&mut self, data: &[u8]) -> Result { /// writer.write_dma(alloc, 0, 256) /// } /// ``` - pub fn write_dma(&mut self, alloc: &Coherent<[u8]>, offset: usize, count: usize) -> Result { + pub fn write_dma( + &mut self, + alloc: &Coherent, + offset: usize, + count: usize, + ) -> Result { let len = alloc.size(); if offset.checked_add(count).ok_or(EOVERFLOW)? > len { return Err(ERANGE); base-commit: dff8302ca1d0e773c90dbeeb05e759f995c95482 -- 2.53.0