Re: [PATCH v5 08/14] mm/gup: do not allow zero page for pinned pages
From: Jason Gunthorpe <jgg@ziepe.ca>
Date: 2021-01-19 18:32:43
Also in:
linux-doc, linux-mm, lkml
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@soleen.com> --- 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