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Date:   Mon, 6 Nov 2023 10:13:54 -0400
From:   Jason Gunthorpe <jgg@ziepe.ca>
To:     "Zhijian Li (Fujitsu)" <lizhijian@fujitsu.com>
Cc:     Zhu Yanjun <yanjun.zhu@linux.dev>,
        "zyjzyj2000@gmail.com" <zyjzyj2000@gmail.com>,
        "leon@kernel.org" <leon@kernel.org>,
        "linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "rpearsonhpe@gmail.com" <rpearsonhpe@gmail.com>,
        "Daisuke Matsuda (Fujitsu)" <matsuda-daisuke@fujitsu.com>,
        "bvanassche@acm.org" <bvanassche@acm.org>,
        "yi.zhang@redhat.com" <yi.zhang@redhat.com>
Subject: Re: [PATCH RFC V2 0/6] rxe_map_mr_sg() fix cleanup and refactor
Message-ID: <20231106141354.GK4634@ziepe.ca>
References: <20231103095549.490744-1-lizhijian@fujitsu.com>
 <d838620b-51df-4216-864e-1c793dae7721@linux.dev>
 <a256a01d-1572-427a-80df-46f2079af967@fujitsu.com>
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On Mon, Nov 06, 2023 at 04:07:19AM +0000, Zhijian Li (Fujitsu) wrote:

> I'm sorry i'm not familiar with the linux MM subsystem. It seem it's safe/correct to access
> address/memory across pages start from the return of
> kmap_loca_page(page).

kmap_local_page() gives you a PAGE_SIZE window only

Jason