From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f41.google.com (mail-wm1-f41.google.com [209.85.128.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 12E0E3CCFA8 for ; Tue, 23 Jun 2026 08:25:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.41 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782203106; cv=none; b=lCdMXGZIKHY8FKTI04cVN5RG/e38nYZ85b0tfoZpWrDdl7E8sbNxjGECheNBK08AlzER1ZkDEaL+ktRKx792WbAoGd84dNOcSfI5i9D1mG9SoXA6OXs8/SFgnYCSS/zYGTQO5A1pvahsQNNtjuzF3i9+5hRr/bXJJisbyhV9lG8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782203106; c=relaxed/simple; bh=ALu77l9JWVXGe1A3hUFppTa6Pdqm7Gq1p7JR3rm89DU=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=ogaz4MT4k50mOOF2jzMX8oR8yISvUGFJam5YL+ccwWHKokDu+/iXuj+E3ZgWzhFAEUQxJ9rn0CO48RyNYZ3lp6JQD+t3Jz92xfGG55v7jWvfzueVwtpleT6cHjSX1SWp0TFY+SizHxwL9HTlaPpF92SCg3Rx/yG084NvTKklv2Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=CrlgJ/mF; arc=none smtp.client-ip=209.85.128.41 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="CrlgJ/mF" Received: by mail-wm1-f41.google.com with SMTP id 5b1f17b1804b1-49241a577d8so27002705e9.3 for ; Tue, 23 Jun 2026 01:25:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1782203103; x=1782807903; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:from:to:cc:subject:date :message-id:reply-to; bh=XqWt0bI44jas3c/HR//JGgX6WMjaPFSRIYH+iY3eOF4=; b=CrlgJ/mFJMMhclIQfH5UZLv8UMNvdShR3QoAmhwaNitLBJcLRiBlrsUfeZl4+ETK0o 4hDXPyzbKjpou5rwFUiVCZFpwoJMs5PjTWP0bsAvxy8+eTHkGmAm0AsHRoLfrpD8Nhe1 Z/D9N6kTHy/R8yvrioyvVEK5thF71O0azIGQv4KyXXF76QYy+QSbqjyMQ4gJpyv+GhGQ JhRcUwa1k6vQ0vaycjKHi2N4Q3srUolQD0EmNuOM2LgsPfTfGCU55N4qVbKorv/LrHDX W5++kk/lBUw+4g5zhLrkoHyfSHcm/pw9j98V6S0wXeBIoiAjgO1xlFHUzgMMMNdmAGqi J3KA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1782203103; x=1782807903; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=XqWt0bI44jas3c/HR//JGgX6WMjaPFSRIYH+iY3eOF4=; b=loIuhQxcJNs016czTqXE45RfAKGEEhG65cQFjlinY3Ylr6LnQKnshX9iENbwmYow5O XgMLjrYdNpxrgEJpjhd4Ec5EShIn9Fg9EaHYkeZcLJnIOnVm0cyFZlkBsCAI5PtSX+0l Rer6rTqEBeRd4bu9l36DhF9XvArCUu5Sgi2VTcbOUmPtTqZWtZ1p0ISgHykly92enbSw eudjV1U9MYpTnW1WBIHEUbaIFT2Wq7loVpE2xGvJMWfZDpyyvU77/nAqbmHShOKM792B +C4uoxGzhNOBPKUVXTfI+ubh5bn14ujfBZ1/cnuEzuQqDCVjwATxvZHKwgojuBLcEfDk 7XqQ== X-Forwarded-Encrypted: i=1; AFNElJ+/SpfsO1vUDuKz1tOZ37XE9CfsS0zcIXlWGZUAxYRb8K1maxzKWVEDSrVuHlE7oUWCSeF53ZMq7DKXxQ==@vger.kernel.org X-Gm-Message-State: AOJu0YzHM44cufRBlbSkZ/escKWxyMpoYX3KF1GiCQ8i9uanDLLr36B5 6+9RAhKF7162gkmydrusom6M2Xg5o7OiIq4MR3XPhadSwoQFymFYzsiM X-Gm-Gg: AfdE7cncSNu80LZ0c7mXXBp/ohxC751LkSa9uEFMHMZ4OmGFkej/IvoAIKssoo2it2u riuxlqPdPspbCO1x1T6OSnRgSQdRGlA6+zb0YsFEw57kcFnEdno7f5ayqJ/KFdSzolYICax/hIe dtfTmtwy1nngzX36cDuckApR0/usjbzCtu8KwrZKLP3ncrkon8MS1j2X535La4hZscZXn2we7ou 2mkj4a0AJTE3XaLYJfm4eOIn2cSoB7a/AbKlliJUyfyqGlkngW2GkjWEYwaJRH7fU39Sx0MjYf1 RRjDZ17t+A/i1rQRC5+by1COUo+bonMlqvLZpI1rfa2T9Wrl7bjaU0FnA/AiEQJ/V68mN5qZgT9 fC+b6MoE5KaGNaoDxalitsFH8ExbV5kpKB6G0Bz71NtuR5tUWZibanUbLBX2NsUzq/K64Ikf94f TI+agsjQvx+3KMY8wnJeVtI/h9/yWBeKCeAm8mtLI9252wqqDbZA== X-Received: by 2002:a05:600c:348f:b0:492:4636:87ae with SMTP id 5b1f17b1804b1-492463687d1mr271367215e9.17.1782203103276; Tue, 23 Jun 2026 01:25:03 -0700 (PDT) Received: from pumpkin (82-69-66-36.dsl.in-addr.zen.co.uk. [82.69.66.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4924923c862sm262149435e9.7.2026.06.23.01.25.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Jun 2026 01:25:02 -0700 (PDT) Date: Tue, 23 Jun 2026 09:25:01 +0100 From: David Laight To: David Hu Cc: Sumit Semwal , Christian =?UTF-8?B?S8O2bmln?= , Jason Gunthorpe , Nicolin Chen , Leon Romanovsky , Kevin Tian , Ankit Agrawal , Alex Williamson , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, jmoroni@google.com, praan@google.com, kpberry@google.com, sashiko-bot , stable@vger.kernel.org Subject: Re: [PATCH] dma-buf: Split sgl by largest page-aligned chunk Message-ID: <20260623092501.17bef195@pumpkin> In-Reply-To: References: <20260621222130.1667453-1-xuehaohu@google.com> <20260622091344.794e0d74@pumpkin> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Mon, 22 Jun 2026 17:26:10 -0400 David Hu wrote: > On Mon, Jun 22, 2026 at 4:13=E2=80=AFAM David Laight > wrote: > > =20 >=20 > Hi David, >=20 > Thank you for your review. You raised many good points regarding > optimizations here. I'll switch to using 2G as the max entry size > (`SZ_2G` from `linux/sizes.h`), and remove divisions and > multiplications. I'll also replace the `for()` loop with `while > (length)`, and drop `min_t()` in favor of `min()` by casting `SZ_2G` > to `size_t`. You shouldn't need a cast at all. David L. > I'll send out a v2 with these changes shortly. >=20 > Thanks, > David