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=-13.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 47908C43461 for ; Fri, 4 Sep 2020 16:52:38 +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 0D64A206B7 for ; Fri, 4 Sep 2020 16:52:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="HLszGPPy"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="hbn1/jps" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0D64A206B7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-riscv-bounces+linux-riscv=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:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=JTkAqOgmVrM6j2Z4yOl//lPBRYh8UJjUj8B34Uuudjw=; b=HLszGPPyamtLwI9p4Hd4j5VxW UJ+760Th4SaqaoniQ3S4HiHOi4Cl7WXLSRqBe61bA+t9psdel//maCavnEqAd3o+M+ocvdqMI0U2e 4GQ1oguy+0ucGJdiHcSdFoeKWjZs/oIxqYr9q+GYl+b6mc4mFmxmwl8YJyS0KnUKwkVB8mQdL6Zn3 g6fO4TgSIp4zLnUMUjwMjYX7Dt14n7S4BIPwTBakQ8FZMGuY2nh74VVEX09rFoHGm8aGiPxiHiMfZ xtWP4RXNLv7SGiH8NieH0TXpXTzjoHysAhGOf4PpYzKzJQOyK60oAYX4Ag/o2eHrt8cN9eppql6Bz RPwlIVIVQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kEEwp-0004JB-CL; Fri, 04 Sep 2020 16:52:23 +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 1kEEwo-0004Is-3p for linux-riscv@merlin.infradead.org; Fri, 04 Sep 2020 16:52:22 +0000 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 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 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-BeenThere: linux-riscv@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-arch@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.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 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv