linux-kernel - Re: [PATCH] userfaultfd/selftests: clean up hugetlb allocation code

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Date:   Tue, 4 Jan 2022 16:24:02 -0800
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Axel Rasmussen <axelrasmussen@...gle.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, Linux MM <linux-mm@...ck.org>,
        Peter Xu <peterx@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Mina Almasry <almasrymina@...gle.com>,
        Shuah Khan <shuah@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] userfaultfd/selftests: clean up hugetlb allocation code

On 1/4/22 14:35, Axel Rasmussen wrote:
> On Mon, Jan 3, 2022 at 6:17 PM Mike Kravetz <mike.kravetz@...cle.com> wrote:
> 
> Looks functionally correct to me besides the one style gripe,
> 
> Reviewed-by: Axel Rasmussen <axelrasmussen@...gle.com>

Thanks Axel!

The userfaultfd test is not so easy to follow.  While looking at this, I
noticed that we skip the mremap() testing for hugetlb.  However, Mina recently
added hugetlb mremap support.  Unfortunately, mremap hugetlb testing fails
if enabled.  I am still trying to determine the root cause, but would like
to eliminate this special case if possible.
-- 
Mike Kravetz