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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id BEDC7C433FE for ; Tue, 12 Apr 2022 11:49:44 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 3DE3D6B0082; Tue, 12 Apr 2022 07:49:44 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 366466B0083; Tue, 12 Apr 2022 07:49:44 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1E08A6B0085; Tue, 12 Apr 2022 07:49:44 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (relay.hostedemail.com [64.99.140.26]) by kanga.kvack.org (Postfix) with ESMTP id 096336B0082 for ; Tue, 12 Apr 2022 07:49:44 -0400 (EDT) Received: from smtpin16.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id C8A97220DF for ; Tue, 12 Apr 2022 11:49:43 +0000 (UTC) X-FDA: 79348057446.16.601A925 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by imf13.hostedemail.com (Postfix) with ESMTP id D743E20003 for ; Tue, 12 Apr 2022 11:49:42 +0000 (UTC) Received: from dggpemm500024.china.huawei.com (unknown [172.30.72.56]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4Kd3sX6zDZzdZtl; Tue, 12 Apr 2022 19:49:04 +0800 (CST) Received: from dggpemm500001.china.huawei.com (7.185.36.107) by dggpemm500024.china.huawei.com (7.185.36.203) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Tue, 12 Apr 2022 19:49:39 +0800 Received: from [10.174.177.243] (10.174.177.243) by dggpemm500001.china.huawei.com (7.185.36.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.2375.24; Tue, 12 Apr 2022 19:49:38 +0800 Message-ID: Date: Tue, 12 Apr 2022 19:49:38 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.5.1 Subject: Re: [RFC PATCH -next V3 1/6] x86: fix function define in copy_mc_to_user Content-Language: en-US To: Tong Tiangen , Mark Rutland , James Morse , Andrew Morton , Thomas Gleixner , "Ingo Molnar" , Borislav Petkov , Robin Murphy , Dave Hansen , "Catalin Marinas" , Will Deacon , "Alexander Viro" , , "H . Peter Anvin" CC: , , , Xie XiuQi References: <20220412072552.2526871-1-tongtiangen@huawei.com> <20220412072552.2526871-2-tongtiangen@huawei.com> From: Kefeng Wang In-Reply-To: <20220412072552.2526871-2-tongtiangen@huawei.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.174.177.243] X-ClientProxiedBy: dggeme707-chm.china.huawei.com (10.1.199.103) To dggpemm500001.china.huawei.com (7.185.36.107) X-CFilter-Loop: Reflected X-Stat-Signature: ue14ikcu7p4qdzssiwjiy9b8mkpizg9f Authentication-Results: imf13.hostedemail.com; dkim=none; spf=pass (imf13.hostedemail.com: domain of wangkefeng.wang@huawei.com designates 45.249.212.187 as permitted sender) smtp.mailfrom=wangkefeng.wang@huawei.com; dmarc=pass (policy=quarantine) header.from=huawei.com X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: D743E20003 X-HE-Tag: 1649764182-19428 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 2022/4/12 15:25, Tong Tiangen wrote: > X86 has it's implementation of copy_mc_to_user but not use #define to > declare. > > This may cause problems, for example, if other architectures open > CONFIG_ARCH_HAS_COPY_MC, but want to use copy_mc_to_user() outside the > architecture, the code add to include/linux/uaddess.h is as follows: > > #ifndef copy_mc_to_user > static inline unsigned long __must_check > copy_mc_to_user(void *dst, const void *src, size_t cnt) > { > ... > } > #endif > > Then this definition will conflict with the implementation of X86 and cause > compilation errors. Does powerpc need this define? > > Fixes: ec6347bb4339 ("x86, powerpc: Rename memcpy_mcsafe() to copy_mc_to_{user, kernel}()") > Signed-off-by: Tong Tiangen > --- > arch/x86/include/asm/uaccess.h | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h > index f78e2b3501a1..e18c5f098025 100644 > --- a/arch/x86/include/asm/uaccess.h > +++ b/arch/x86/include/asm/uaccess.h > @@ -415,6 +415,7 @@ copy_mc_to_kernel(void *to, const void *from, unsigned len); > > unsigned long __must_check > copy_mc_to_user(void *to, const void *from, unsigned len); > +#define copy_mc_to_user copy_mc_to_user > #endif > > /*