linux-kernel - Re: [PATCH v3 7/7] mm/gup: remove vmas array from internal GUP functions

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Message-ID: <4150a48f-8c6c-4631-d61a-abbd0ba83eeb@redhat.com>
Date:   Mon, 17 Apr 2023 13:15:15 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Lorenzo Stoakes <lstoakes@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <muchun.song@...ux.dev>
Subject: Re: [PATCH v3 7/7] mm/gup: remove vmas array from internal GUP
 functions

On 15.04.23 14:09, Lorenzo Stoakes wrote:
> Now we have eliminated all callers to GUP APIs which use the vmas
> parameter, eliminate it altogether.
> 
> This eliminates a class of bugs where vmas might have been kept around
> longer than the mmap_lock and thus we need not be concerned about locks
> being dropped during this operation leaving behind dangling pointers.
> 
> This simplifies the GUP API and makes it considerably clearer as to its
> purpose - follow flags are applied and if pinning, an array of pages is
> returned.
> 
> Signed-off-by: Lorenzo Stoakes <lstoakes@...il.com>
> ---

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb