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[2620:137:e000::1:20]) by mx.google.com with ESMTP id o6-20020a056a001bc600b0067ea74ba1fbsi8773463pfw.328.2023.08.14.18.47.00; Mon, 14 Aug 2023 18:47:11 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=m+4vGTbg; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233702AbjHOAsb (ORCPT + 99 others); Mon, 14 Aug 2023 20:48:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58120 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233510AbjHOAsV (ORCPT ); Mon, 14 Aug 2023 20:48:21 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9F4CB1726 for ; Mon, 14 Aug 2023 17:48:20 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 3587664872 for ; Tue, 15 Aug 2023 00:48:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5E27CC433CC; Tue, 15 Aug 2023 00:48:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1692060499; bh=u1nWpIWuw7k0zAnF/NQi2BJwAjoLPN0MnaMyy2rE3OY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=m+4vGTbgbE+G2m55otkANO02MVzGEQh6P3wkbDIeKAc61Ge4ipns3aCly/jAe4662 /x/bB18nxReFR6fch5pOQItf2Y0nH3kizE7YbHIYeyeZj4DTTd2ShXjwa3AkqS3wGy 2sHLa6fcriwlG6N2VFhCXyebVd+8TkYnpxkGM4l3Fjjm+jTAj1ivbji7qF6QU57Y+H hG0hNX6AqE5MNSqZILVB9hPj+39Q9WdBjKrIuY/mTMOWlE6XVYhZr/ZX4hEUN27wAk LxZJFrr86j3mZs5YqGYm1/7UrLxm7YQ0rec3LWTNNswfIYf0Yih20vPN/W3EY2wttt 2faWVWD8mbw8A== From: Vineet Gupta To: linux-snps-arc@lists.infradead.org Cc: linux-kernel@vger.kernel.org, Shahab Vahedi , Alexey Brodkin , Vineet Gupta Subject: [PATCH 03/20] ARC: uaccess: elide unaliged handling if hardware supports Date: Mon, 14 Aug 2023 17:47:56 -0700 Message-Id: <20230815004813.555115-4-vgupta@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230815004813.555115-1-vgupta@kernel.org> References: <20230815004813.555115-1-vgupta@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Vineet Gupta --- arch/arc/include/asm/uaccess.h | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/arch/arc/include/asm/uaccess.h b/arch/arc/include/asm/uaccess.h index d2da159bb80a..1e8809ea000a 100644 --- a/arch/arc/include/asm/uaccess.h +++ b/arch/arc/include/asm/uaccess.h @@ -146,8 +146,9 @@ raw_copy_from_user(void *to, const void __user *from, unsigned long n) if (n == 0) return 0; - /* unaligned */ - if (((unsigned long)to & 0x3) || ((unsigned long)from & 0x3)) { + /* fallback for unaligned access when hardware doesn't support */ + if (!IS_ENABLED(CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS) && + (((unsigned long)to & 0x3) || ((unsigned long)from & 0x3))) { unsigned char tmp; @@ -373,8 +374,9 @@ raw_copy_to_user(void __user *to, const void *from, unsigned long n) if (n == 0) return 0; - /* unaligned */ - if (((unsigned long)to & 0x3) || ((unsigned long)from & 0x3)) { + /* fallback for unaligned access when hardware doesn't support */ + if (!IS_ENABLED(CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS) && + (((unsigned long)to & 0x3) || ((unsigned long)from & 0x3))) { unsigned char tmp; -- 2.34.1