On Fri, 2019-08-16 at 07:52:20 UTC, Christophe Leroy wrote: > copy_page() and clear_page() expect page aligned destination, and > use dcbz instruction to clear entire cache lines based on the > assumption that the destination is cache aligned. > > As shown during analysis of a bug in BTRFS filesystem, a misaligned > copy_page() can create bugs that are difficult to locate (see Link). > > Add an explicit WARNING when copy_page() or clear_page() are called > with misaligned destination. > > Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr> > Cc: Erhard F. <erhar...@mailbox.org> > Link: https://bugzilla.kernel.org/show_bug.cgi?id=204371
Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/7ab0b7cb8951d4095d73e203759b74d41916e455 cheers
