On Mon, Jan 18, 2021 at 11:39:14PM -0500, Pavel Tatashin wrote: > Zero page should not be used for long term pinned pages. Once pages > are pinned their physical addresses cannot changed until they are unpinned. > > Guarantee to always return real pages when they are pinned by adding > FOLL_WRITE. > > Signed-off-by: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx> > --- > mm/gup.c | 10 +++++++++- > 1 file changed, 9 insertions(+), 1 deletion(-) No, this will definitely break things Why does the zero page have to be movable? Jason
