linux-kernel - Re: [PATCH RFC V2 0/6] rxe_map_mr

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Message-ID: <20231106141354.GK4634@ziepe.ca>
Date:   Mon, 6 Nov 2023 10:13:54 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     "Zhijian Li (Fujitsu)" <lizhijian@...itsu.com>
Cc:     Zhu Yanjun <yanjun.zhu@...ux.dev>,
        "zyjzyj2000@...il.com" <zyjzyj2000@...il.com>,
        "leon@...nel.org" <leon@...nel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rpearsonhpe@...il.com" <rpearsonhpe@...il.com>,
        "Daisuke Matsuda (Fujitsu)" <matsuda-daisuke@...itsu.com>,
        "bvanassche@....org" <bvanassche@....org>,
        "yi.zhang@...hat.com" <yi.zhang@...hat.com>
Subject: Re: [PATCH RFC V2 0/6] rxe_map_mr_sg() fix cleanup and refactor

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