linux-kernel - Re: [PATCH v4] selftest/vm: add mremap expand merge offset test

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Message-ID: <6c3725b7-53af-bcc7-2a58-a35b2bc08b4f@redhat.com>
Date:   Mon, 2 Jan 2023 17:59:01 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Lorenzo Stoakes <lstoakes@...il.com>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Vlastimil Babka <vbabka@...e.cz>,
        Jakub Matena <matenajakub@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Michal Hocko <mhocko@...nel.org>
Subject: Re: [PATCH v4] selftest/vm: add mremap expand merge offset test

On 02.01.23 17:11, Lorenzo Stoakes wrote:
> Add a test to assert that we can mremap() and expand a mapping starting
> from an offset within an existing mapping. We unmap the last page in a 3
> page mapping to ensure that the remap should always succeed, before
> remapping from the 2nd page.
> 
> This is additionally a regression test for the issue solved in "mm, mremap:
> fix mremap() expanding vma with addr inside vma" and confirmed to fail
> prior to the change and pass after it.
> 
> Finally, this patch updates the existing mremap expand merge test to check
> error conditions and reduce code duplication between the two tests.
> 
> Signed-off-by: Lorenzo Stoakes <lstoakes@...il.com>
> ---

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

-- 
Thanks,

David / dhildenb