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Peter Anvin" CC: , , , , Kefeng Wang , Xie XiuQi , Guohanjun , Tong Tiangen Subject: [PATCH -next v7 1/4] uaccess: add generic fallback version of copy_mc_to_user() Date: Fri, 12 Aug 2022 07:05:54 +0000 Message-ID: <20220812070557.1028499-2-tongtiangen@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220812070557.1028499-1-tongtiangen@huawei.com> References: <20220812070557.1028499-1-tongtiangen@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To kwepemm600017.china.huawei.com (7.193.23.234) X-CFilter-Loop: Reflected ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1660287991; a=rsa-sha256; cv=none; b=n3M9VVJRZVe8ZAqfvM6HcTqyBR+XiTCkIqbEQBdOpVKxeiE06qcYi1btlNoWT6gT1+lXVX RZoTySPA41dgACqmpSvda1K5et8KTWYmIiPJwTJwRAEC/JXp4x5GUkZnCAERrSkeYHfzGU g/m+QcMMopvxRv7G+Hpg7QPEu07NmEg= ARC-Authentication-Results: i=1; imf03.hostedemail.com; dkim=none; spf=pass (imf03.hostedemail.com: domain of tongtiangen@huawei.com designates 45.249.212.255 as permitted sender) smtp.mailfrom=tongtiangen@huawei.com; dmarc=pass (policy=quarantine) header.from=huawei.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1660287991; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=rmrvhio2YZLA+OoFpK4GbMQAILWLTAFAKTmFxAzMXxs=; b=xj5g2yNHzr23bD/3Tb15kCwRb8a0/zDPr0HfSJnsBv03eWgu6MalRfri7+i9FC2/Li4T+r ZPCGqeJSoqDFV7CRN+9kbZ64cWyntfLLKzmt+QsaztfnC8JP/Ya1Uit9KKKwL4gBisY+Sb yPFJvjZIPA/jb42Phj/bRBma8b9ePO0= X-Stat-Signature: jsxgmkmzuiqg9ownj46o74wa6rm74qbr X-Rspamd-Queue-Id: EFC932003D X-Rspam-User: X-Rspamd-Server: rspam03 Authentication-Results: imf03.hostedemail.com; dkim=none; spf=pass (imf03.hostedemail.com: domain of tongtiangen@huawei.com designates 45.249.212.255 as permitted sender) smtp.mailfrom=tongtiangen@huawei.com; dmarc=pass (policy=quarantine) header.from=huawei.com X-HE-Tag: 1660287989-602 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: 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 3ddc65c63a49..82dc55707c4b 100644 --- a/arch/powerpc/include/asm/uaccess.h +++ b/arch/powerpc/include/asm/uaccess.h @@ -357,6 +357,7 @@ copy_mc_to_user(void __user *to, const void *from, unsigned long n) return n; } +#define copy_mc_to_user copy_mc_to_user #endif 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 913e593a3b45..64ba7f723ddf 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -512,6 +512,7 @@ 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 /* diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h index 47e5d374c7eb..6f48ad43a82e 100644 --- a/include/linux/uaccess.h +++ b/include/linux/uaccess.h @@ -174,6 +174,15 @@ copy_mc_to_kernel(void *dst, const void *src, size_t cnt) } #endif +#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++; -- 2.25.1