UFFD_FEATURE_WP_ASYNC
if (features & UFFD_FEATURE_WP_ASYNC)
uffdio_api.features &= ~UFFD_FEATURE_WP_ASYNC;
return ctx && (ctx->features & UFFD_FEATURE_WP_ASYNC);
UFFD_FEATURE_WP_ASYNC | \
UFFD_FEATURE_WP_ASYNC | \
uffdio_api.features = UFFD_FEATURE_WP_UNPOPULATED | UFFD_FEATURE_WP_ASYNC |
!(uffdio_api.features & UFFD_FEATURE_WP_ASYNC) ||