Re: [PATCH RFC V2 0/6] rxe_map_mr_sg() fix cleanup and refactor

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Subject: Re: [PATCH RFC V2 0/6] rxe_map_mr_sg() fix cleanup and refactor
From: Jason Gunthorpe <jgg@xxxxxxxx>
Date: Mon, 6 Nov 2023 10:13:54 -0400
Cc: Zhu Yanjun <yanjun.zhu@xxxxxxxxx>, "zyjzyj2000@xxxxxxxxx" <zyjzyj2000@xxxxxxxxx>, "leon@xxxxxxxxxx" <leon@xxxxxxxxxx>, "linux-rdma@xxxxxxxxxxxxxxx" <linux-rdma@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "rpearsonhpe@xxxxxxxxx" <rpearsonhpe@xxxxxxxxx>, "Daisuke Matsuda (Fujitsu)" <matsuda-daisuke@xxxxxxxxxxx>, "bvanassche@xxxxxxx" <bvanassche@xxxxxxx>, "yi.zhang@xxxxxxxxxx" <yi.zhang@xxxxxxxxxx>
In-reply-to: <a256a01d-1572-427a-80df-46f2079af967@fujitsu.com>
References: <20231103095549.490744-1-lizhijian@fujitsu.com> <d838620b-51df-4216-864e-1c793dae7721@linux.dev> <a256a01d-1572-427a-80df-46f2079af967@fujitsu.com>

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

References:
- [PATCH RFC V2 0/6] rxe_map_mr_sg() fix cleanup and refactor
  - From: Li Zhijian
- Re: [PATCH RFC V2 0/6] rxe_map_mr_sg() fix cleanup and refactor
  - From: Zhu Yanjun
- Re: [PATCH RFC V2 0/6] rxe_map_mr_sg() fix cleanup and refactor
  - From: Zhijian Li (Fujitsu)

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