>> - if (!new_hpage) >> + /* >> + * Getting a new hugepage with alloc_huge_page() (which can happen >> + * when migration is caused by mbind()) can return ERR_PTR value, >> + * so we need take care of the case here. >> + */ >> + if (!new_hpage || IS_ERR_VALUE(new_hpage)) >> return -ENOMEM; > > Please no. get_new_page returns NULL or a page. You are hooking a wrong > callback here. The error value doesn't make any sense here. IMO you > should just wrap alloc_huge_page by something that returns NULL or page. I suggest just opposite way. new_vma_page() always return ENOMEM, ENOSPC etc instad of NULL. and caller propegate it to userland. I guess userland want to distingush why mbind was failed. Anyway, If new_vma_page() have a change to return both NULL and -ENOMEM. That's a bug. -- 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>