From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3C7FDC43463 for ; Sun, 20 Sep 2020 15:16:40 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B14B9206B7 for ; Sun, 20 Sep 2020 15:16:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="z8qncXs2"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="BEHRWzks" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B14B9206B7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=GTi48gl3WFuiQES8eTBySi1swAwVzKLufO5YvZ3p5yk=; b=z8qncXs2Cz/G9pke05mkv/HKh mMgF4svho8gTolDj6PeHYFuEuUGZdG/A3w0Z55xgSynyeUXWSoj1ytqCfnZCvASo248uqmDNxjRXa 3VRYX6wKUuI563IlBrKTGPi9gL8ZFBif3FRB9dQu3ZMMz0pRjzxBX9PdYZzMLfxMZHPt+AWLVFCz7 U+qvYdOeyprqz44bWt7oKY4s1ZkOyzlABWZDqxtl18c3VQEVKSdHOdNf1g+3k74WmwKvkfwZDqUfy x5qDNa2eFoz4g1Sifkih1tn5nxeejriGbknsoBdD7ac1perWkbzDiq0dFtEgrLFim7gnxkHEAa4EZ vFSlpizeg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kK13a-0005Hc-12; Sun, 20 Sep 2020 15:15:14 +0000 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kK13Y-0005HU-SG for linux-arm-kernel@merlin.infradead.org; Sun, 20 Sep 2020 15:15:12 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=Ucf7HoNcpbOE1Nwd0GkK0r+4jGnJB6Awau+HMvD5QTQ=; b=BEHRWzksrTjJ0cz6kn/YL4kbO9 O0S1oDQ5afrWGBLkgZVov0K5DX5P8n3kQPInesZq8Opmeexe0KTNU5zkAjvbPAa7Vu+AwqUEF9kkV s09ZOl4m8v1spojFIQBVRxpVintgH+lHEWDdjnkhUWSJDFXQaimPUKpk6c+gLvdLoxlpoR55UirIR C7FOSIh6C1I8oA+JRJOY1riBqiSdxp8JHhQOJrK3Az+Zf34gwu76Cu4rYBA3pcShPktuZzK8Fl9p+ KTdDanCXPZQo05/zui4ihlNXLDU70euY+ORH9c4QQIqcTHg/9okYwp8yGFJLLvFCR++YjtJR+fDE0 5GxFYx2A==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kK13W-00060V-36; Sun, 20 Sep 2020 15:15:10 +0000 Date: Sun, 20 Sep 2020 16:15:10 +0100 From: Matthew Wilcox To: Christoph Hellwig Subject: Re: [PATCH 1/9] kernel: add a PF_FORCE_COMPAT flag Message-ID: <20200920151510.GS32101@casper.infradead.org> References: <20200918124533.3487701-1-hch@lst.de> <20200918124533.3487701-2-hch@lst.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200918124533.3487701-2-hch@lst.de> X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-aio@kvack.org, linux-mips@vger.kernel.org, David Howells , linux-mm@kvack.org, keyrings@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, x86@kernel.org, Arnd Bergmann , linux-block@vger.kernel.org, Alexander Viro , io-uring@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Jens Axboe , linux-parisc@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, linux-fsdevel@vger.kernel.org, Andrew Morton , linuxppc-dev@lists.ozlabs.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Sep 18, 2020 at 02:45:25PM +0200, Christoph Hellwig wrote: > Add a flag to force processing a syscall as a compat syscall. This is > required so that in_compat_syscall() works for I/O submitted by io_uring > helper threads on behalf of compat syscalls. Al doesn't like this much, but my suggestion is to introduce two new opcodes -- IORING_OP_READV32 and IORING_OP_WRITEV32. The compat code can translate IORING_OP_READV to IORING_OP_READV32 and then the core code can know what that user pointer is pointing to. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel