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 98AE5C43461 for ; Fri, 4 Sep 2020 16:52:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5CF0C20795 for ; Fri, 4 Sep 2020 16:52:57 +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="Za/C7EJ5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727088AbgIDQwu (ORCPT ); Fri, 4 Sep 2020 12:52:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54214 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726776AbgIDQwb (ORCPT ); Fri, 4 Sep 2020 12:52:31 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6458DC061247; Fri, 4 Sep 2020 09:52:31 -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=jyR+thWFl9yovqfD6e7m1+8w49D6KcsvNTSMukRAbP4=; b=Za/C7EJ5Epel2pydZVQNQyXvkZ RBg+GEGW3LCENRiHa7eO06hyRkjBEZuo9vElJXSkrxPGInx4xqCNuIS++r6l+3IfoRZ+X3N4ywZtl oD3p7tEWWiDAfZXBadg6ZmFwW1UYSu/q5kX1+7L8AiN3lVckm2meS56DhxyX09T8QtBATRsCfUotw hluXkEuLfdAfgW7wADC1i1W5rBTbe6ftBsrEorexitomun9YoPMazT+6S/OYEB66OLWC5dBuArpXP PtOcujo2MQdbKgzK12Wq+bCfGA7U9tMVJ6n/Et1IfDnZogqhHJhTnbfUpintfDhNZQ72+jqpDfhq8 B7cuMuPQ==; 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 1kEEwu-000140-1l; Fri, 04 Sep 2020 16:52:28 +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 7/8] riscv: implement __get_kernel_nofault and __put_user_nofault Date: Fri, 4 Sep 2020 18:52:15 +0200 Message-Id: <20200904165216.1799796-8-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 Implemet the non-faulting kernel access helpers directly instead of abusing the uaccess routines under set_fs(KERNEL_DS). Signed-off-by: Christoph Hellwig --- arch/riscv/include/asm/uaccess.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/riscv/include/asm/uaccess.h b/arch/riscv/include/asm/uaccess.h index b67d1c616ec348..264e52fb62b143 100644 --- a/arch/riscv/include/asm/uaccess.h +++ b/arch/riscv/include/asm/uaccess.h @@ -486,6 +486,26 @@ unsigned long __must_check clear_user(void __user *to, unsigned long n) __ret; \ }) +#define HAVE_GET_KERNEL_NOFAULT + +#define __get_kernel_nofault(dst, src, type, err_label) \ +do { \ + long __kr_err; \ + \ + __get_user_nocheck(*((type *)(dst)), (type *)(src), __kr_err); \ + if (unlikely(__kr_err)) \ + goto err_label; \ +} while (0) + +#define __put_kernel_nofault(dst, src, type, err_label) \ +do { \ + long __kr_err; \ + \ + __put_user_nocheck(*((type *)(dst)), (type *)(src), __kr_err); \ + if (unlikely(__kr_err)) \ + goto err_label; \ +} while (0) + #else /* CONFIG_MMU */ #include #endif /* CONFIG_MMU */ -- 2.28.0