On Fri, Aug 03, 2018 at 07:00:43PM -0300, Thiago Jung Bauermann wrote: > If the userfaultfd test is run on a kernel with CONFIG_USERFAULTFD=n, it > will report that the system call is not available yet go ahead and continue > anyway: > > # ./userfaultfd anon 30 1 > nr_pages: 480, nr_pages_per_cpu: 120 > userfaultfd syscall not available in this kernel > bounces: 0, mode:, register failure > > This is because userfaultfd_open() returns 0 on success and 1 on error but > all callers assume that it returns < 0 on error. > > Since the convention of the test as a whole is the one used by > userfault_open(), fix its callers instead. Now the test behaves correctly: > > # ./userfaultfd anon 30 1 > nr_pages: 480, nr_pages_per_cpu: 120 > userfaultfd syscall not available in this kernel > > Signed-off-by: Thiago Jung Bauermann <bauer...@linux.ibm.com>
Reviewed-by: Mike Rapoport <r...@linux.vnet.ibm.com> > --- > tools/testing/selftests/vm/userfaultfd.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/tools/testing/selftests/vm/userfaultfd.c > b/tools/testing/selftests/vm/userfaultfd.c > index 7b8171e3128a..e4099afe7557 100644 > --- a/tools/testing/selftests/vm/userfaultfd.c > +++ b/tools/testing/selftests/vm/userfaultfd.c > @@ -859,7 +859,7 @@ static int userfaultfd_zeropage_test(void) > if (uffd_test_ops->release_pages(area_dst)) > return 1; > > - if (userfaultfd_open(0) < 0) > + if (userfaultfd_open(0)) > return 1; > uffdio_register.range.start = (unsigned long) area_dst; > uffdio_register.range.len = nr_pages * page_size; > @@ -902,7 +902,7 @@ static int userfaultfd_events_test(void) > > features = UFFD_FEATURE_EVENT_FORK | UFFD_FEATURE_EVENT_REMAP | > UFFD_FEATURE_EVENT_REMOVE; > - if (userfaultfd_open(features) < 0) > + if (userfaultfd_open(features)) > return 1; > fcntl(uffd, F_SETFL, uffd_flags | O_NONBLOCK); > > @@ -961,7 +961,7 @@ static int userfaultfd_sig_test(void) > return 1; > > features = UFFD_FEATURE_EVENT_FORK|UFFD_FEATURE_SIGBUS; > - if (userfaultfd_open(features) < 0) > + if (userfaultfd_open(features)) > return 1; > fcntl(uffd, F_SETFL, uffd_flags | O_NONBLOCK); > > @@ -1027,7 +1027,7 @@ static int userfaultfd_stress(void) > if (!area_dst) > return 1; > > - if (userfaultfd_open(0) < 0) > + if (userfaultfd_open(0)) > return 1; > > count_verify = malloc(nr_pages * sizeof(unsigned long long)); -- Sincerely yours, Mike.
