Am 15.03.2016 um 16:37 schrieb Christoph Hellwig: > On Tue, Mar 15, 2016 at 04:32:40PM +0100, Richard Weinberger wrote: >>> Or if ->page_mkwrite() was called, why the page is not dirty? >> >> BTW: UBIFS does not implement ->migratepage(), could this be a problem? > > This might be the reason. I can't reall make sense of > buffer_migrate_page, but it seems to migrate buffer_head state to > the new page. > > I'd love to know why CMA even tries to migrate pages that don't have a > ->migratepage method, this seems incredibly dangerous to me. FYI, with a dummy ->migratepage() which returns only -EINVAL UBIFS does no longer explode upon page migration. Tomorrow I'll do more tests to make sure. Thanks, //richard -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>