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shuah@kernel.org >> Cc: linux-kselftest@vger.kernel.org; linux-kernel@vger.kernel.org; Chris Hyser >> Subject: Re: [PATCH v2 2/2] selftests: sched: skip cs_prctl_test for systems with core scheduling disabled >> >> On 24-02-2025 01:49 pm, Shrikanth Hegde wrote: > ... >>> If the self-tests are to be used in development flow, these checks may >>> not be sufficient. >> >> Right, this particular case was overlooked. To handle this, the test >> could take a path to the custom config as an argument. I shall work on >> getting this fixed. > > I was thinking something along the lines of just calling the prctl. > > If you call it and SCHED_CORE is not configured, you will get an EINVAL. Unfortunately, > passing other bad values in the other prctl args will also give an EINVAL, but if you call it with a > non-existent PID (say max_pid + 1) it will generate an ESRCH if the code is present. > > So something like (and I'd look up the maxpid on the actual system): > > int check_core_sched() > { > ret = prctl(PR_SCHED_CORE, PR_SCHED_CORE_GET, 32769, PIDTYPE_PID, > (unsigned long)&cookie); > > printf("ret = %d\n", ret); > perror("Error:\n"); > } > Thanks for the suggestion Chris, this indeed would be a better method and also fit in well with the development workflow. I'll give this a try and send out the updated patch soon. Regards, Shan > -chrish