From 41078907eef0dd508d0999996d10683ae114c21a Mon Sep 17 00:00:00 2001 From: Andrii Nakryiko Date: Fri, 13 Mar 2020 17:27:43 -0700 Subject: selftests/bpf: Fix nanosleep for real this time Amazingly, some libc implementations don't call __NR_nanosleep syscall from their nanosleep() APIs. Hammer it down with explicit syscall() call and never get back to it again. Also simplify code for timespec initialization. I verified that nanosleep is called w/ printk and in exactly same Linux image that is used in Travis CI. So it should both sleep and call correct syscall. v1->v2: - math is too hard, fix usec -> nsec convertion (Martin); - test_vmlinux has explicit nanosleep() call, convert that one as well. Fixes: 4e1fd25d19e8 ("selftests/bpf: Fix usleep() implementation") Signed-off-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann Acked-by: Martin KaFai Lau Link: https://lore.kernel.org/bpf/20200314002743.3782677-1-andriin@fb.com --- tools/testing/selftests/bpf/test_progs.c | 16 ++++++---------- 1 file changed, 6 insertions(+), 10 deletions(-) (limited to 'tools/testing/selftests/bpf/test_progs.c') diff --git a/tools/testing/selftests/bpf/test_progs.c b/tools/testing/selftests/bpf/test_progs.c index f85a06512541..dc12fd0de1c2 100644 --- a/tools/testing/selftests/bpf/test_progs.c +++ b/tools/testing/selftests/bpf/test_progs.c @@ -35,16 +35,12 @@ struct prog_test_def { */ int usleep(useconds_t usec) { - struct timespec ts; - - if (usec > 999999) { - ts.tv_sec = usec / 1000000; - ts.tv_nsec = usec % 1000000; - } else { - ts.tv_sec = 0; - ts.tv_nsec = usec; - } - return nanosleep(&ts, NULL); + struct timespec ts = { + .tv_sec = usec / 1000000, + .tv_nsec = (usec % 1000000) * 1000, + }; + + return syscall(__NR_nanosleep, &ts, NULL); } static bool should_run(struct test_selector *sel, int num, const char *name) -- cgit v1.2.3