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Message-ID: <20180410014153.GB31282@bombadil.infradead.org> Date: Mon, 9 Apr 2018 18:41:53 -0700 From: Matthew Wilcox <willy@...radead.org> To: Mike Kravetz <mike.kravetz@...cle.com> Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, Hugh Dickins <hughd@...gle.com>, Andrea Arcangeli <aarcange@...hat.com>, Michal Hocko <mhocko@...nel.org>, Marc-André Lureau <marcandre.lureau@...il.com>, David Herrmann <dh.herrmann@...il.com>, Khalid Aziz <khalid.aziz@...cle.com>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [PATCH v3 3/3] mm: restructure memfd code On Mon, Apr 09, 2018 at 04:05:05PM -0700, Mike Kravetz wrote: > +/* > + * We need a tag: a new tag would expand every radix_tree_node by 8 bytes, > + * so reuse a tag which we firmly believe is never set or cleared on shmem. > + */ > +#define SHMEM_TAG_PINNED PAGECACHE_TAG_TOWRITE Do we also firmly believe it's never used on hugetlbfs?
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