Re: [PATCHv2] selftests: kselftest.h: mark functions with 'noreturn'
From: Shuah Khan
Date: Wed Nov 17 2021 - 08:40:55 EST
On 11/17/21 4:01 AM, Anders Roxell wrote:
On Wed, 3 Nov 2021 at 19:38, Nick Desaulniers <ndesaulniers@xxxxxxxxxx> wrote:
On Wed, Nov 3, 2021 at 2:47 AM Anders Roxell <anders.roxell@xxxxxxxxxx> wrote:
When building kselftests/capabilities the following warning shows up:
clang -O2 -g -std=gnu99 -Wall test_execve.c -lcap-ng -lrt -ldl -o test_execve
test_execve.c:121:13: warning: variable 'have_outer_privilege' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
} else if (unshare(CLONE_NEWUSER | CLONE_NEWNS) == 0) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
test_execve.c:136:9: note: uninitialized use occurs here
return have_outer_privilege;
^~~~~~~~~~~~~~~~~~~~
test_execve.c:121:9: note: remove the 'if' if its condition is always true
} else if (unshare(CLONE_NEWUSER | CLONE_NEWNS) == 0) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
test_execve.c:94:27: note: initialize the variable 'have_outer_privilege' to silence this warning
bool have_outer_privilege;
^
= false
Rework so all the ksft_exit_*() functions have attribue
'__attribute__((noreturn))' so the compiler knows that there wont be
any return from the function. That said, without
'__attribute__((noreturn))' the compiler warns about the above issue
since it thinks that it will get back from the ksft_exit_skip()
function, which it wont.
Cleaning up the callers that rely on ksft_exit_*() return code, since
the functions ksft_exit_*() have never returned anything.
Signed-off-by: Anders Roxell <anders.roxell@xxxxxxxxxx>
---
tools/testing/selftests/clone3/clone3.c | 4 +++-
.../testing/selftests/clone3/clone3_clear_sighand.c | 2 +-
tools/testing/selftests/clone3/clone3_set_tid.c | 4 +++-
tools/testing/selftests/ipc/msgque.c | 10 +++++-----
tools/testing/selftests/kcmp/kcmp_test.c | 2 +-
tools/testing/selftests/kselftest.h | 12 ++++++------
.../membarrier/membarrier_test_multi_thread.c | 2 +-
.../membarrier/membarrier_test_single_thread.c | 2 +-
tools/testing/selftests/pidfd/pidfd_fdinfo_test.c | 2 +-
tools/testing/selftests/pidfd/pidfd_open_test.c | 4 +++-
tools/testing/selftests/pidfd/pidfd_poll_test.c | 2 +-
tools/testing/selftests/pidfd/pidfd_test.c | 2 +-
tools/testing/selftests/resctrl/resctrl_tests.c | 6 +++---
tools/testing/selftests/sync/sync_test.c | 2 +-
tools/testing/selftests/timers/adjtick.c | 4 ++--
tools/testing/selftests/timers/alarmtimer-suspend.c | 4 ++--
tools/testing/selftests/timers/change_skew.c | 4 ++--
tools/testing/selftests/timers/clocksource-switch.c | 4 ++--
tools/testing/selftests/timers/freq-step.c | 4 ++--
tools/testing/selftests/timers/inconsistency-check.c | 4 ++--
tools/testing/selftests/timers/leap-a-day.c | 10 +++++-----
tools/testing/selftests/timers/leapcrash.c | 4 ++--
tools/testing/selftests/timers/mqueue-lat.c | 4 ++--
tools/testing/selftests/timers/nanosleep.c | 4 ++--
tools/testing/selftests/timers/nsleep-lat.c | 4 ++--
tools/testing/selftests/timers/posix_timers.c | 12 ++++++------
tools/testing/selftests/timers/raw_skew.c | 6 +++---
tools/testing/selftests/timers/set-2038.c | 4 ++--
tools/testing/selftests/timers/set-tai.c | 4 ++--
tools/testing/selftests/timers/set-timer-lat.c | 4 ++--
tools/testing/selftests/timers/set-tz.c | 4 ++--
tools/testing/selftests/timers/skew_consistency.c | 4 ++--
tools/testing/selftests/timers/threadtest.c | 2 +-
tools/testing/selftests/timers/valid-adjtimex.c | 6 +++---
tools/testing/selftests/vm/madv_populate.c | 2 +-
35 files changed, 80 insertions(+), 74 deletions(-)
diff --git a/tools/testing/selftests/clone3/clone3.c b/tools/testing/selftests/clone3/clone3.c
index 42be3b925830..ede5da0c67b4 100644
--- a/tools/testing/selftests/clone3/clone3.c
+++ b/tools/testing/selftests/clone3/clone3.c
@@ -191,5 +191,7 @@ int main(int argc, char *argv[])
test_clone3(CLONE_NEWPID, getpagesize() + 8, -E2BIG,
CLONE3_ARGS_NO_TEST);
- return !ksft_get_fail_cnt() ? ksft_exit_pass() : ksft_exit_fail();
+ if (ksft_get_fail_cnt())
+ ksft_exit_fail();
+ ksft_exit_pass();
}
diff --git a/tools/testing/selftests/clone3/clone3_clear_sighand.c b/tools/testing/selftests/clone3/clone3_clear_sighand.c
index 47a8c0fc3676..dcd9448eaeec 100644
--- a/tools/testing/selftests/clone3/clone3_clear_sighand.c
+++ b/tools/testing/selftests/clone3/clone3_clear_sighand.c
@@ -124,5 +124,5 @@ int main(int argc, char **argv)
test_clone3_clear_sighand();
- return ksft_exit_pass();
+ ksft_exit_pass();
}
diff --git a/tools/testing/selftests/clone3/clone3_set_tid.c b/tools/testing/selftests/clone3/clone3_set_tid.c
index 0229e9ebb995..a755fcd3af89 100644
--- a/tools/testing/selftests/clone3/clone3_set_tid.c
+++ b/tools/testing/selftests/clone3/clone3_set_tid.c
@@ -393,5 +393,7 @@ int main(int argc, char *argv[])
out:
ret = 0;
- return !ret ? ksft_exit_pass() : ksft_exit_fail();
+ if (ret)
+ ksft_exit_fail();
+ ksft_exit_pass();
This case is weird (pre-existing-ly) and looks broken. The assignment
to ret should probably occur _before_ the out: label. Honestly, I'd
remove the use of goto from this function and just call either
ksft_exit_pass() or ksft_exit_fail().
I can do that in a followup patch.
Let's fold this change in. Please send me v3 with.
thanks,
-- Shuah