linux-kernel - Re: [PATCH RFC V2 4/6] RDMA/rxe: Use PAGE_SIZE and PAGE_SHIFT to extract address from page

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Date:   Fri, 3 Nov 2023 14:59:35 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Li Zhijian <lizhijian@...itsu.com>
Cc:     zyjzyj2000@...il.com, leon@...nel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, rpearsonhpe@...il.com,
        matsuda-daisuke@...itsu.com, bvanassche@....org,
        yi.zhang@...hat.com
Subject: Re: [PATCH RFC V2 4/6] RDMA/rxe: Use PAGE_SIZE and PAGE_SHIFT to
 extract address from page_list

On Fri, Nov 03, 2023 at 05:55:47PM +0800, Li Zhijian wrote:
> As we said in previous commit, page_list only stores PAGE_SIZE page, so
> when we extract an address from the page_list, we should use PAGE_SIZE
> and PAGE_SHIFT instead of the ibmr.page_size.

The concept was that the xarray could store anything larger than
PAGE_SIZE and the entry would point at the first struct page of the
contiguous chunk

That looks like it is right, or at least close to right, so lets try
to keep it

Jason