On Wed, Jul 12, 2023 at 09:42:07PM -0700, Darrick J. Wong wrote: > On Mon, Jul 10, 2023 at 02:02:45PM +0100, Matthew Wilcox (Oracle) wrote: > > copy_page_from_iter_atomic() already handles !highmem compound > > pages correctly, but if we are passed a highmem compound page, > > each base page needs to be mapped & unmapped individually. > > > > Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> > > Yikes. Does this want a fixes tag? I was wondering the same thing. I think the bug is merely latent, and all existing users limit themselves to being within the page that they're passing in.
