linux-kernel - Re: [PATCH v2] mm: re-allow pinning of zero pfns (again)

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Message-ID: <b120cf98-85e0-75d5-30f9-44306b036cdd@nvidia.com>
Date:   Sun, 28 Aug 2022 10:16:54 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     akpm@...ux-foundation.org, alex.sierra@....com,
        willy@...radead.org, hch@....de, Felix.Kuehling@....com,
        apopple@...dia.com, david@...hat.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mm: re-allow pinning of zero pfns (again)

On 8/28/22 05:37, Alex Williamson wrote:
>> Those notes are all about (some of) the callers. But it's a simple
>> answer, really, so how about just this:
>>
>> 	/* The zero page is always allowed to be pinned. */
> 
> Sure.  Are we looking for a re-spin with this?  I see Andrew already
> added this incremental change to his hotfix-unstable branch separately.
> I'd hate for a comment re-spin to delay getting a fix for this problem,
> that blocks any VM use cases of VFIO, into mainline any longer.  Thanks,
> 

Definitely not. Andrews fixup should suffice.


thanks,

-- 
John Hubbard
NVIDIA