selftests/cgroup: Fix compile error in test_cpu.c

JIRA: https://issues.redhat.com/browse/RHEL-80382

commit 11312c8
Author: Xiu Jianfeng <xiujianfeng@huawei.com>
Date:   Fri Oct 11 06:11:53 2024 +0000

    selftests/cgroup: Fix compile error in test_cpu.c

    When compiling the cgroup selftests with the following command:

    make -C tools/testing/selftests/cgroup/

    the compiler complains as below:

    test_cpu.c: In function ‘test_cpucg_nice’:
    test_cpu.c:284:39: error: incompatible type for argument 2 of ‘hog_cpus_timed’
      284 |                 hog_cpus_timed(cpucg, param);
          |                                       ^~~~~
          |                                       |
          |                                       struct cpu_hog_func_param
    test_cpu.c:132:53: note: expected ‘void *’ but argument is of type ‘struct cpu_hog_func_param’
      132 | static int hog_cpus_timed(const char *cgroup, void *arg)
          |                                               ~~~~~~^~~

    Fix it by passing the address of param to hog_cpus_timed().

    Fixes: 2e82c0d ("cgroup/rstat: Selftests for niced CPU statistics")
    Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
    Signed-off-by: Tejun Heo <tj@kernel.org>

Signed-off-by: Radostin Stoyanov <rstoyano@redhat.com>

Author: rst0git

tools/testing/selftests/cgroup/test_cpu.c

@@ -279,7 +279,7 @@ static int test_cpucg_nice(const char *root)
 
 		/* Try to keep niced CPU usage as constrained to hog_cpu as possible */
 		nice(1);
-		hog_cpus_timed(cpucg, param);
+		hog_cpus_timed(cpucg, &param);
 		exit(0);
 	} else {
 		waitpid(pid, &status, 0);