From nobody Wed Sep 17 14:14:16 2025 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 16064C7EE2C for ; Mon, 8 May 2023 01:45:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232615AbjEHBpD (ORCPT ); Sun, 7 May 2023 21:45:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48458 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232542AbjEHBo6 (ORCPT ); Sun, 7 May 2023 21:44:58 -0400 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 35CF612093 for ; Sun, 7 May 2023 18:44:57 -0700 (PDT) Received: from kwepemm600017.china.huawei.com (unknown [172.30.72.55]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4QF3vr6r9rzsR5p; Mon, 8 May 2023 09:43:04 +0800 (CST) Received: from localhost.localdomain (10.175.112.125) by kwepemm600017.china.huawei.com (7.193.23.234) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.23; Mon, 8 May 2023 09:44:53 +0800 From: Tong Tiangen To: Catalin Marinas , Mark Rutland , James Morse , Andrew Morton , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Robin Murphy , Dave Hansen , Will Deacon , Alexander Viro , , "H . Peter Anvin" CC: , , , Kefeng Wang , Guohanjun , Xie XiuQi , Tong Tiangen Subject: [PATCH -next v9 1/5] uaccess: add generic fallback version of copy_mc_to_user() Date: Mon, 8 May 2023 09:44:32 +0800 Message-ID: <20230508014436.198717-2-tongtiangen@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230508014436.198717-1-tongtiangen@huawei.com> References: <20230508014436.198717-1-tongtiangen@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To kwepemm600017.china.huawei.com (7.193.23.234) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" x86/powerpc has it's implementation of copy_mc_to_user(), we add generic fallback in include/linux/uaccess.h prepare for other architechures to enable CONFIG_ARCH_HAS_COPY_MC. Signed-off-by: Tong Tiangen Acked-by: Michael Ellerman --- arch/powerpc/include/asm/uaccess.h | 1 + arch/x86/include/asm/uaccess.h | 1 + include/linux/uaccess.h | 9 +++++++++ 3 files changed, 11 insertions(+) diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/= uaccess.h index a2d255aa9627..1713dff36568 100644 --- a/arch/powerpc/include/asm/uaccess.h +++ b/arch/powerpc/include/asm/uaccess.h @@ -381,6 +381,7 @@ copy_mc_to_user(void __user *to, const void *from, unsi= gned long n) =20 return n; } +#define copy_mc_to_user copy_mc_to_user #endif =20 extern long __copy_from_user_flushcache(void *dst, const void __user *src, diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h index 457e814712af..37d3c078d768 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -573,6 +573,7 @@ copy_mc_to_kernel(void *to, const void *from, unsigned = len); =20 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 =20 /* diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h index 3064314f4832..550287c92990 100644 --- a/include/linux/uaccess.h +++ b/include/linux/uaccess.h @@ -205,6 +205,15 @@ copy_mc_to_kernel(void *dst, const void *src, size_t c= nt) } #endif =20 +#ifndef copy_mc_to_user +static inline unsigned long __must_check +copy_mc_to_user(void *dst, const void *src, size_t cnt) +{ + check_object_size(src, cnt, true); + return raw_copy_to_user(dst, src, cnt); +} +#endif + static __always_inline void pagefault_disabled_inc(void) { current->pagefault_disabled++; --=20 2.25.1