linux-kernel - Re: [PATCH 1/1] infiniband/mm: convert put_page() to put_user

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Message-ID: <6a18af65-7071-2531-d767-42ba74ad82c4@nvidia.com>
Date:   Thu, 23 May 2019 15:54:08 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Ira Weiny <ira.weiny@...el.com>
CC:     Jason Gunthorpe <jgg@...lanox.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        Doug Ledford <dledford@...hat.com>,
        "Mike Marciniszyn" <mike.marciniszyn@...el.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Christian Benvenuti <benve@...co.com>,
        "Jan Kara" <jack@...e.cz>
Subject: Re: [PATCH 1/1] infiniband/mm: convert put_page() to put_user_page*()

On 5/23/19 3:50 PM, John Hubbard wrote:
> [...] 
> I was thinking of it as a temporary measure, only up until, but not including the
> point where put_user_pages() becomes active. That is, the point when put_user_pages
> starts decrementing GUP_PIN_COUNTING_BIAS, instead of just forwarding to put_page().
> 
> (For other readers, that's this patch:
> 
>     "mm/gup: debug tracking of get_user_pages() references"
> 
> ...in https://github.com/johnhubbard/linux/tree/gup_dma_core )
> 

Arggh, correction, I meant this patch:

    "mm/gup: track gup-pinned pages"

...sorry for any confusion there.

thanks,
-- 
John Hubbard
NVIDIA