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[45.249.212.190]) by mx.google.com with ESMTPS id e1si5593701otq.243.2019.07.08.01.07.54 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 08 Jul 2019 01:07:54 -0700 (PDT) Received-SPF: pass (google.com: domain of zhongjiang@huawei.com designates 45.249.212.190 as permitted sender) client-ip=45.249.212.190; Authentication-Results: mx.google.com; spf=pass (google.com: domain of zhongjiang@huawei.com designates 45.249.212.190 as permitted sender) smtp.mailfrom=zhongjiang@huawei.com Received: from DGGEMS407-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 284F1FEF5DB1A49B8B75; Mon, 8 Jul 2019 16:07:49 +0800 (CST) Received: from linux-ibm.site (10.175.102.37) by DGGEMS407-HUB.china.huawei.com (10.3.19.207) with Microsoft SMTP Server id 14.3.439.0; Mon, 8 Jul 2019 16:07:47 +0800 From: zhong jiang To: , , CC: , Subject: [PATCH] mm: redefine the MAP_SHARED_VALIDATE to other value Date: Mon, 8 Jul 2019 16:05:41 +0800 Message-ID: <1562573141-11258-1-git-send-email-zhongjiang@huawei.com> X-Mailer: git-send-email 1.7.12.4 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.175.102.37] X-CFilter-Loop: Reflected 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: As the mman manual says, mmap should return fails when we assign the flags to MAP_SHARED | MAP_PRIVATE. But In fact, We run the code successfully and unexpected. It is because MAP_SHARED_VALIDATE is introduced and equal to MAP_SHARED | MAP_PRIVATE. Signed-off-by: zhong jiang --- include/uapi/linux/mman.h | 2 +- tools/include/uapi/asm-generic/mman-common-tools.h | 2 +- tools/include/uapi/linux/mman.h | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/include/uapi/linux/mman.h b/include/uapi/linux/mman.h index fc1a64c..1d3098e 100644 --- a/include/uapi/linux/mman.h +++ b/include/uapi/linux/mman.h @@ -14,7 +14,7 @@ #define MAP_SHARED 0x01 /* Share changes */ #define MAP_PRIVATE 0x02 /* Changes are private */ -#define MAP_SHARED_VALIDATE 0x03 /* share + validate extension flags */ +#define MAP_SHARED_VALIDATE 0x04 /* share + validate extension flags */ /* * Huge page size encoding when MAP_HUGETLB is specified, and a huge page diff --git a/tools/include/uapi/asm-generic/mman-common-tools.h b/tools/include/uapi/asm-generic/mman-common-tools.h index af7d0d3..4fc44d2 100644 --- a/tools/include/uapi/asm-generic/mman-common-tools.h +++ b/tools/include/uapi/asm-generic/mman-common-tools.h @@ -18,6 +18,6 @@ #ifndef MAP_SHARED #define MAP_SHARED 0x01 /* Share changes */ #define MAP_PRIVATE 0x02 /* Changes are private */ -#define MAP_SHARED_VALIDATE 0x03 /* share + validate extension flags */ +#define MAP_SHARED_VALIDATE 0x04 /* share + validate extension flags */ #endif #endif // __ASM_GENERIC_MMAN_COMMON_TOOLS_ONLY_H diff --git a/tools/include/uapi/linux/mman.h b/tools/include/uapi/linux/mman.h index fc1a64c..1d3098e 100644 --- a/tools/include/uapi/linux/mman.h +++ b/tools/include/uapi/linux/mman.h @@ -14,7 +14,7 @@ #define MAP_SHARED 0x01 /* Share changes */ #define MAP_PRIVATE 0x02 /* Changes are private */ -#define MAP_SHARED_VALIDATE 0x03 /* share + validate extension flags */ +#define MAP_SHARED_VALIDATE 0x04 /* share + validate extension flags */ /* * Huge page size encoding when MAP_HUGETLB is specified, and a huge page -- 1.7.12.4