linux-kernel - Re: [PATCH v5 03/14] mm/gup: return an error on migration failure

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Date:   Tue, 19 Jan 2021 14:28:25 -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, linux-doc@...r.kernel.org,
        ira.weiny@...el.com, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v5 03/14] mm/gup: return an error on migration failure

On Mon, Jan 18, 2021 at 11:39:09PM -0500, Pavel Tatashin wrote:
> When migration failure occurs, we still pin pages, which means
> that we may pin CMA movable pages which should never be the case.
> 
> Instead return an error without pinning pages when migration failure
> happens.
> 
> No need to retry migrating, because migrate_pages() already retries
> 10 times.
> 
> Signed-off-by: Pavel Tatashin <pasha.tatashin@...een.com>
>  mm/gup.c | 17 +++++++----------
>  1 file changed, 7 insertions(+), 10 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>