[resend RFC 3/3] tests: add new PR_SCHED_CORE_SHARE test

[Christian Brauner <brauner@kernel.org>]

Add tests for the new PR_SCHED_CORE_SHARE command.

Cc: Peter Collingbourne <pcc@google.com>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Chris Hyser <chris.hyser@oracle.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ben Segall <bsegall@google.com>
Cc: Balbir Singh <sblbir@amazon.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-kselftest@vger.kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
---
 tools/testing/selftests/sched/cs_prctl_test.c | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/tools/testing/selftests/sched/cs_prctl_test.c b/tools/testing/selftests/sched/cs_prctl_test.c
index 8109b17dc764..985b83fe7221 100644
--- a/tools/testing/selftests/sched/cs_prctl_test.c
+++ b/tools/testing/selftests/sched/cs_prctl_test.c
@@ -229,6 +229,7 @@ int main(int argc, char *argv[])
 	int pidx;
 	int pid;
 	int opt;
+	int i;
 
 	while ((opt = getopt(argc, argv, ":hkT:P:d:")) != -1) {
 		switch (opt) {
@@ -325,6 +326,28 @@ int main(int argc, char *argv[])
 	validate(get_cs_cookie(pid) != 0);
 	validate(get_cs_cookie(pid) == get_cs_cookie(procs[pidx].thr_tids[0]));
 
+	printf("\n## Set a new cookie on a single thread/PR_SCHED_CORE_SCOPE_THREAD [%d]\n", pid);
+	if (_prctl(PR_SCHED_CORE, PR_SCHED_CORE_CREATE, pid, PR_SCHED_CORE_SCOPE_THREAD, 0) < 0)
+		handle_error("core_sched create failed -- PR_SCHED_CORE_SCOPE_THREAD");
+	disp_processes(num_processes, procs);
+
+	validate(get_cs_cookie(pid) != get_cs_cookie(procs[pidx].thr_tids[0]));
+
+	printf("\n## Copy cookie from a thread [%d] to [%d] as PR_SCHED_CORE_SCOPE_THREAD\n", pid, procs[pidx].thr_tids[0]);
+	if (_prctl(PR_SCHED_CORE, PR_SCHED_CORE_SHARE, procs[pidx].thr_tids[0], PR_SCHED_CORE_SCOPE_THREAD, pid) < 0)
+		handle_error("core_sched share cookie from and to thread failed -- PR_SCHED_CORE_SCOPE_THREAD");
+	disp_processes(num_processes, procs);
+
+	validate(get_cs_cookie(pid) == get_cs_cookie(procs[pidx].thr_tids[0]));
+
+	printf("\n## Copy cookie from a thread [%d] to [%d] as PR_SCHED_CORE_SCOPE_THREAD_GROUP\n", pid, pid);
+	if (_prctl(PR_SCHED_CORE, PR_SCHED_CORE_SHARE, pid, PR_SCHED_CORE_SCOPE_THREAD_GROUP, pid) < 0)
+		handle_error("core_sched share cookie from and to thread-group failed -- PR_SCHED_CORE_SCOPE_THREAD_GROUP");
+	disp_processes(num_processes, procs);
+
+	for (i = 0; i < procs[pidx].num_threads; ++i)
+		validate(get_cs_cookie(pid) == get_cs_cookie(procs[pidx].thr_tids[i]));
+
 	if (errors) {
 		printf("TESTS FAILED. errors: %d\n", errors);
 		res = 10;
-- 
2.32.0