selftests/powerpc: Move pick_online_cpu() up into utils.c

We want to use this in another test, so make it available at the top of
the powerpc selftests tree.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

tools/testing/selftests/powerpc/pmu/Makefile

@@ -2,7 +2,7 @@ noarg:
 	$(MAKE) -C ../
 
 TEST_PROGS := count_instructions l3_bank_test per_event_excludes
-EXTRA_SOURCES := ../harness.c event.c lib.c
+EXTRA_SOURCES := ../harness.c event.c lib.c ../utils.c
 
 all: $(TEST_PROGS) ebb
 

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

@@ -15,32 +15,6 @@
 #include "lib.h"
 
 
-int pick_online_cpu(void)
-{
-	cpu_set_t mask;
-	int cpu;
-
-	CPU_ZERO(&mask);
-
-	if (sched_getaffinity(0, sizeof(mask), &mask)) {
-		perror("sched_getaffinity");
-		return -1;
-	}
-
-	/* We prefer a primary thread, but skip 0 */
-	for (cpu = 8; cpu < CPU_SETSIZE; cpu += 8)
-		if (CPU_ISSET(cpu, &mask))
-			return cpu;
-
-	/* Search for anything, but in reverse */
-	for (cpu = CPU_SETSIZE - 1; cpu >= 0; cpu--)
-		if (CPU_ISSET(cpu, &mask))
-			return cpu;
-
-	printf("No cpus in affinity mask?!\n");
-	return -1;
-}
-
 int bind_to_cpu(int cpu)
 {
 	cpu_set_t mask;

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

@@ -19,7 +19,6 @@ union pipe {
 	int fds[2];
 };
 
-extern int pick_online_cpu(void);
 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);

tools/testing/selftests/powerpc/utils.c

@@ -3,10 +3,13 @@
  * Licensed under GPLv2.
  */
 
+#define _GNU_SOURCE	/* For CPU_ZERO etc. */
+
 #include <elf.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <link.h>
+#include <sched.h>
 #include <stdio.h>
 #include <sys/stat.h>
 #include <sys/types.h>
@@ -56,3 +59,29 @@ void *get_auxv_entry(int type)
 	close(fd);
 	return result;
 }
+
+int pick_online_cpu(void)
+{
+	cpu_set_t mask;
+	int cpu;
+
+	CPU_ZERO(&mask);
+
+	if (sched_getaffinity(0, sizeof(mask), &mask)) {
+		perror("sched_getaffinity");
+		return -1;
+	}
+
+	/* We prefer a primary thread, but skip 0 */
+	for (cpu = 8; cpu < CPU_SETSIZE; cpu += 8)
+		if (CPU_ISSET(cpu, &mask))
+			return cpu;
+
+	/* Search for anything, but in reverse */
+	for (cpu = CPU_SETSIZE - 1; cpu >= 0; cpu--)
+		if (CPU_ISSET(cpu, &mask))
+			return cpu;
+
+	printf("No cpus in affinity mask?!\n");
+	return -1;
+}

tools/testing/selftests/powerpc/utils.h

@@ -22,6 +22,7 @@ typedef uint8_t u8;
 
 int test_harness(int (test_function)(void), char *name);
 extern void *get_auxv_entry(int type);
+int pick_online_cpu(void);
 
 static inline bool have_hwcap2(unsigned long ftr2)
 {