linux-kernel - Re: [PATCH 1/6] mm/gup: perform check_dax_vmas only when FS

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Date:   Wed, 2 Dec 2020 12:29:58 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Pavel Tatashin <pasha.tatashin@...een.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, vbabka@...e.cz, mhocko@...e.com,
        david@...hat.com, osalvador@...e.de, dan.j.williams@...el.com,
        sashal@...nel.org, tyhicks@...ux.microsoft.com,
        iamjoonsoo.kim@....com, mike.kravetz@...cle.com,
        rostedt@...dmis.org, mingo@...hat.com, peterz@...radead.org,
        mgorman@...e.de, willy@...radead.org, rientjes@...gle.com,
        jhubbard@...dia.com
Subject: Re: [PATCH 1/6] mm/gup: perform check_dax_vmas only when FS_DAX is
 enabled

On Wed, Dec 02, 2020 at 12:23:25AM -0500, Pavel Tatashin wrote:
> There is no need to check_dax_vmas() and run through the npage loop of
> pinned pages if FS_DAX is not enabled.
> 
> Add a stub check_dax_vmas() function for no-FS_DAX case.
> 
> Signed-off-by: Pavel Tatashin <pasha.tatashin@...een.com>
> ---.
>  mm/gup.c | 7 +++++++
>  1 file changed, 7 insertions(+)

I have a patch to delete check_dax_vmas that is just waiting on me to
figure out how to test with dax. That makes all this ifdefery much
simpler

Jason