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[45.249.212.32]) by mx.google.com with ESMTPS id 59si10789138ota.198.2019.07.08.18.53.30 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 08 Jul 2019 18:53:31 -0700 (PDT) Received-SPF: pass (google.com: domain of zhongjiang@huawei.com designates 45.249.212.32 as permitted sender) client-ip=45.249.212.32; Authentication-Results: mx.google.com; spf=pass (google.com: domain of zhongjiang@huawei.com designates 45.249.212.32 as permitted sender) smtp.mailfrom=zhongjiang@huawei.com Received: from DGGEMS406-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id E197C582CD666893E410; Tue, 9 Jul 2019 09:53:25 +0800 (CST) Received: from [127.0.0.1] (10.177.29.68) by DGGEMS406-HUB.china.huawei.com (10.3.19.206) with Microsoft SMTP Server id 14.3.439.0; Tue, 9 Jul 2019 09:53:20 +0800 Message-ID: <5D23F38F.5060008@huawei.com> Date: Tue, 9 Jul 2019 09:53:19 +0800 From: zhong jiang User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: Matthew Wilcox CC: , , , , Subject: Re: [PATCH] mm: redefine the MAP_SHARED_VALIDATE to other value References: <1562573141-11258-1-git-send-email-zhongjiang@huawei.com> <20190708144319.GE32320@bombadil.infradead.org> In-Reply-To: <20190708144319.GE32320@bombadil.infradead.org> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.177.29.68] 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: On 2019/7/8 22:43, Matthew Wilcox wrote: > On Mon, Jul 08, 2019 at 04:05:41PM +0800, zhong jiang wrote: >> 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. > No, you don't understand. Look back at the introduction of > MAP_SHARED_VALIDATE. > > . > Thanks, I will look at the patch deeply. Sincerely, zhong jiang