[PATCH v4 05/12] selftests/mm: Print some details when uffd-stress gets bad params

So this can be debugged more easily.

Signed-off-by: Brendan Jackman jackmanb@google.com --- tools/testing/selftests/mm/uffd-stress.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/uffd-stress.c b/tools/testing/selftests/mm/uffd-stress.c index d6b57e5a2e1d7611aa1588ee41601ce16117a574..4ba5bf13a0108435ce8b53340b9e17ccd47e859e 100644 --- a/tools/testing/selftests/mm/uffd-stress.c +++ b/tools/testing/selftests/mm/uffd-stress.c @@ -457,7 +457,8 @@ int main(int argc, char **argv)

nr_pages_per_cpu = bytes / page_size / nr_parallel; if (!nr_pages_per_cpu) { - _err("invalid MiB"); + _err("pages_per_cpu = 0, cannot test (%lu / %lu / %lu)", + bytes, page_size, nr_parallel); usage(); }