[LTP] [PATCH] sched: add sched sysctl sanity test

[Cyril Hrubis]

Hi!
> > +static void rt_runtime_us_einval(void)
> > +{
> > +	TST_EXP_FAIL(write(runtime_fd, "-2", 2), EINVAL,
> > +	             "echo -2 > "RT_RUNTIME_US);
> > +}
> 
> I would happily add my tags to the test except that as a general
> principal, I don't want to deal with tests that fail if an unexpected
> error number is returned.
> 
> Unless something can be done (e.g. with meta-data), so that TST_EXP_FAIL
> and similar can be reduced to a TCONF when the wrong errno is returned.
> 
> For instance, this would allow running the tests with a seccomp BPF
> profile, LSM, CGroup or /proc bind mount that blocks the write.
> 
> Or you could just seperate the tests I guess. Then the reset can be
> checked while skipping the errno checks.

Hmm, so I guess that with LSM we are able to open these files R/W but we
can stil get EPERM from the write() right? I'm reluctant to add wildcard
TCONF on any errno, but I guess that we can add a TST_EXP_FAIL macro
version that would have one errno for PASS and one errno for TCONF.

-- 
Cyril Hrubis
chrubis@suse.cz