syscalls/sched_getattr02: use a fixed size for EINVAL test

Test is using a 'size' based on sizeof(struct sched_attr), but
since c48700d ("sched_attr: Do not define for glibc >= 2.41")
that structure can now be defined by glibc which also defines additional
fields.

The kernel only checks if size is smaller than SCHED_ATTR_SIZE_VER0 (48 bytes).
Use a fixed size (SCHED_ATTR_SIZE_VER0 - 1) for the test.

Signed-off-by: Jan Stancek <[email protected]>
Reviewed-by: Li Wang <[email protected]>
Reviewed-by: Petr Vorel <[email protected]>

include/lapi/sched.h

@@ -46,6 +46,8 @@ static inline int sched_getattr(pid_t pid, struct sched_attr *attr,
 {
 	return syscall(__NR_sched_getattr, pid, attr, size, flags);
 }
+
+# define SCHED_ATTR_SIZE_VER0 48	/* sizeof first published struct */
 #endif
 
 #ifndef HAVE_CLONE3

testcases/kernel/syscalls/sched_getattr/sched_getattr02.c

@@ -51,7 +51,7 @@ static struct test_case {
 } test_cases[] = {
 	{&unused_pid, &attr_copy, sizeof(struct sched_attr), 0, ESRCH},
 	{&pid, NULL, sizeof(struct sched_attr), 0, EINVAL},
-	{&pid, &attr_copy, sizeof(struct sched_attr) - 1, 0, EINVAL},
+	{&pid, &attr_copy, SCHED_ATTR_SIZE_VER0 - 1, 0, EINVAL},
 	{&pid, &attr_copy, sizeof(struct sched_attr), 1000, EINVAL}
 };