On Wed, Jul 24, 2019 at 04:26:58PM -0700, Ralph Campbell wrote: > Struct page for ZONE_DEVICE private pages uses the page->mapping and > and page->index fields while the source anonymous pages are migrated to > device private memory. This is so rmap_walk() can find the page when > migrating the ZONE_DEVICE private page back to system memory. > ZONE_DEVICE pmem backed fsdax pages also use the page->mapping and > page->index fields when files are mapped into a process address space. > > Add comments to struct page and remove the unused "_zd_pad_1" field > to make this more clear. > > Signed-off-by: Ralph Campbell <[email protected]> > Reviewed-by: John Hubbard <[email protected]> > Cc: Matthew Wilcox <[email protected]> > Cc: Vlastimil Babka <[email protected]> > Cc: Christoph Lameter <[email protected]> > Cc: Dave Hansen <[email protected]> > Cc: Jérôme Glisse <[email protected]> > Cc: "Kirill A . Shutemov" <[email protected]> > Cc: Lai Jiangshan <[email protected]> > Cc: Martin Schwidefsky <[email protected]> > Cc: Pekka Enberg <[email protected]> > Cc: Randy Dunlap <[email protected]> > Cc: Andrey Ryabinin <[email protected]> > Cc: Christoph Hellwig <[email protected]> > Cc: Jason Gunthorpe <[email protected]> > Cc: Andrew Morton <[email protected]> > Cc: Linus Torvalds <[email protected]> > include/linux/mm_types.h | 11 ++++++++++- > 1 file changed, 10 insertions(+), 1 deletion(-)
Ralph, you marked some of thes patches as mm/hmm, but I feel it is best if Andrew takes them through the normal -mm path. They don't touch hmm.c or mmu notifiers so I don't forsee conflicts, and I don't feel comfortable to review this code. Regards, Jason
