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 8FD8322688B for ; Wed, 7 May 2025 21:54:03 +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=1746654843; cv=none; b=P147Qgx0WTCx+iIUpFtE3QUV49dEhbmKwa/BG7ybYzle2mfsR4pFZree3qMOHympzcalRHF8jdp0Abg+JUYavhGKmew8pk2HELiJaVD6bXzSqsG0pd2G6NGR/AjkMxQ6GdE3e6klzyroNDauKHQNIFrEdQUn4m6uSFyZEiJlykE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746654843; c=relaxed/simple; bh=F0NOw/HhhdXcai5+04nG+KmxK5Y1lHdd27d4W5YPT0A=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=kw6xDz9WbTDp5EYaf3fIWtXWOIsZGrAcEB7wQakUCRyXoTyNqVjusHVNS0L9dc/GYorwOuRLGzowFkVhB45B+oItyYl1KX53CzOOwFJJjX61kTzJWnaQctOOtb42TJcMYzyQnXqv0sje60kSsXl52rnmijHyV8Nqzovqrp9KfLk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=bqIZIXJd; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="bqIZIXJd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B7B96C4CEE7; Wed, 7 May 2025 21:54:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1746654843; bh=F0NOw/HhhdXcai5+04nG+KmxK5Y1lHdd27d4W5YPT0A=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=bqIZIXJdo1vgb4dJgvLtTgj1mBU5YPAQ2rZJDKygUJMuEwOxOdUigrAwjHoR5DIxk sa43vkpKRRl1zIBPdWhEGtIGoKIU/2My9OJ254/pMQpThUqd52zCUV//0Ddr3kR1NE 1URG4Tbp4OEPwicJVM8iMnaBwSpDPkwK/fYu6qbU= Date: Wed, 7 May 2025 14:54:02 -0700 From: Andrew Morton To: Pantelis Antoniou Cc: , , Artem Krupotkin , Charles Briere , Wade Farnsworth Subject: Re: [PATCH 0/1] Fix zero copy I/O on __get_user_pages allocated pages Message-Id: <20250507145402.d162d92fa29130d690461a0b@linux-foundation.org> In-Reply-To: <20250507154105.763088-1-p.antoniou@partner.samsung.com> References: <20250507154105.763088-1-p.antoniou@partner.samsung.com> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.33; x86_64-pc-linux-gnu) 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=US-ASCII Content-Transfer-Encoding: 7bit On Wed, 7 May 2025 10:41:04 -0500 Pantelis Antoniou wrote: > One example of that is the 9p filesystem which is commonly used in qemu > based setups for sharing files with the host. > > In our emulation environment we have noticed failing writes when performing > I/O from a userspace mapped DRM GEM buffer object. > The platform does not use VRAM, all graphics memory is regular DRAM memory, > allocated via __get_free_pages > > The same write was successful from a heap allocated bounce buffer. > > The sequence of events is as follows. > > .. > There's a lot of good stuff in this [0/N], but a single patch "series" is cumbersome. Can you please redo this as a standalone patch in which the changelog is the union of [0/1] and [1/1]?