selftests/powerpc: Move bind_to_cpu() to utils.h

This function will be useful in the DSCR test patches later in this
series, so promote it to be shared by all powerpc selftests.
Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230406043320.125138-3-bgray@linux.ibm.com

tools/testing/selftests/powerpc/include/utils.h

@@ -32,6 +32,7 @@ void *find_auxv_entry(int type, char *auxv);
 void *get_auxv_entry(int type);
 
 int pick_online_cpu(void);
+int bind_to_cpu(int cpu);
 
 int parse_intmax(const char *buffer, size_t count, intmax_t *result, int base);
 int parse_uintmax(const char *buffer, size_t count, uintmax_t *result, int base);

tools/testing/selftests/powerpc/pmu/lib.c

@@ -14,19 +14,6 @@
 #include "utils.h"
 #include "lib.h"
 
-
-int bind_to_cpu(int cpu)
-{
-	cpu_set_t mask;
-
-	printf("Binding to cpu %d\n", cpu);
-
-	CPU_ZERO(&mask);
-	CPU_SET(cpu, &mask);
-
-	return sched_setaffinity(0, sizeof(mask), &mask);
-}
-
 #define PARENT_TOKEN	0xAA
 #define CHILD_TOKEN	0x55
 

tools/testing/selftests/powerpc/pmu/lib.h

@@ -20,7 +20,6 @@ union pipe {
 	int fds[2];
 };
 
-extern int bind_to_cpu(int cpu);
 extern int kill_child_and_wait(pid_t child_pid);
 extern int wait_for_child(pid_t child_pid);
 extern int sync_with_child(union pipe read_pipe, union pipe write_pipe);

tools/testing/selftests/powerpc/utils.c

@@ -452,6 +452,18 @@ int pick_online_cpu(void)
 	return cpu;
 }
 
+int bind_to_cpu(int cpu)
+{
+	cpu_set_t mask;
+
+	printf("Binding to cpu %d\n", cpu);
+
+	CPU_ZERO(&mask);
+	CPU_SET(cpu, &mask);
+
+	return sched_setaffinity(0, sizeof(mask), &mask);
+}
+
 bool is_ppc64le(void)
 {
 	struct utsname uts;