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=-12.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 D447EC433E2 for ; Fri, 4 Sep 2020 16:55:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A903620795 for ; Fri, 4 Sep 2020 16:55:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="hbn1/jps" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726259AbgIDQzE (ORCPT ); Fri, 4 Sep 2020 12:55:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54186 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726293AbgIDQwZ (ORCPT ); Fri, 4 Sep 2020 12:52:25 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3F1CAC061244; Fri, 4 Sep 2020 09:52:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=MkSVtcwaZuMrc9OzI8eVvOG/Cdl/4QZOV215qZC/7jE=; b=hbn1/jpsA3yTfNkNCn8x40H4wn 8GMkx35SdpSHWCWGmQKnvmoEzVV6IYm7D9vOKw5mwVdoCNsk0QO9VlNbWD7Kw8EBa05GzrYUMnkQp YpaoZOmuc/VK6vRbaBkRlZyFkCM1JIlGBIqkGLoKqyQaTRkqjkcirWhj4glZltC1xFPijF7QuD17+ LQ+0cKgf4Syn/SzNwk1XRUpJyvFSTWCo4GNudNQN168jaPspKm+SMdsT59xydtvhydNNl2MQQj/oE mXjs46r3MnbpMkEM2wIxIT0iABaCUF3cX0wOiAMorxQq3aJFHW64CfcfEhGutpoPsWsOcmL3+jJx3 RfXkGJ4Q==; Received: from [2001:4bb8:184:af1:704:22b1:700d:1395] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kEEwm-00012c-D9; Fri, 04 Sep 2020 16:52:21 +0000 From: Christoph Hellwig To: Paul Walmsley , Palmer Dabbelt , Arnd Bergmann , Alexander Viro Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org Subject: [PATCH 1/8] maccess: add a generic __{get,put}_kernel_nofault for nommu Date: Fri, 4 Sep 2020 18:52:09 +0200 Message-Id: <20200904165216.1799796-2-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200904165216.1799796-1-hch@lst.de> References: <20200904165216.1799796-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Nommu architectures do not have page tables and thus no page faults. Implement the maccess helpers using get_unaligned and put_unaligned and enable them unconditionally for !CONFIG_MMU. Signed-off-by: Christoph Hellwig --- include/asm-generic/uaccess.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/include/asm-generic/uaccess.h b/include/asm-generic/uaccess.h index ba68ee4dabfaa7..cc3b2c8b68fab4 100644 --- a/include/asm-generic/uaccess.h +++ b/include/asm-generic/uaccess.h @@ -9,6 +9,26 @@ */ #include +#ifndef CONFIG_MMU +#include + +#define __get_kernel_nofault(dst, src, type, err_label) \ +do { \ + *((type *)dst) = get_unaligned((type *)(src)); \ + if (0) /* make sure the label looks used to the compiler */ \ + goto err_label; \ +} while (0) + +#define __put_kernel_nofault(dst, src, type, err_label) \ +do { \ + put_unaligned(*((type *)src), (type *)(dst)); \ + if (0) /* make sure the label looks used to the compiler */ \ + goto err_label; \ +} while (0) + +#define HAVE_GET_KERNEL_NOFAULT 1 +#endif /* !CONFIG_MMU */ + #ifdef CONFIG_UACCESS_MEMCPY static inline __must_check unsigned long raw_copy_from_user(void *to, const void __user * from, unsigned long n) -- 2.28.0