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Date:   Wed, 2 Aug 2023 16:34:21 +0100
From:   Mel Gorman <mgorman@techsingularity.net>
To:     David Hildenbrand <david@redhat.com>
Cc:     linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        linux-fsdevel@vger.kernel.org, kvm@vger.kernel.org,
        linux-kselftest@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        liubo <liubo254@huawei.com>, Peter Xu <peterx@redhat.com>,
        Matthew Wilcox <willy@infradead.org>,
        Hugh Dickins <hughd@google.com>,
        Jason Gunthorpe <jgg@ziepe.ca>,
        John Hubbard <jhubbard@nvidia.com>,
        Mel Gorman <mgorman@suse.de>, Shuah Khan <shuah@kernel.org>,
        Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH v2 6/8] mm/huge_memory: remove stale NUMA hinting comment
 from follow_trans_huge_pmd()
Message-ID: <20230802153421.x5455znvogns5dfv@techsingularity.net>
References: <20230801124844.278698-1-david@redhat.com>
 <20230801124844.278698-7-david@redhat.com>
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On Tue, Aug 01, 2023 at 02:48:42PM +0200, David Hildenbrand wrote:
> That comment for pmd_protnone() was added in commit 2b4847e73004
> ("mm: numa: serialise parallel get_user_page against THP migration"), which
> noted:
> 
> 	THP does not unmap pages due to a lack of support for migration
> 	entries at a PMD level.  This allows races with get_user_pages
> 
> Nowadays, we do have PMD migration entries, so the comment no longer
> applies. Let's drop it.
> 
> Signed-off-by: David Hildenbrand <david@redhat.com>

Acked-by: Mel Gorman <mgorman@techsingularity.net>

-- 
Mel Gorman
SUSE Labs