[PATCH 1/3] selftests/powerpc: Add a helper for checking if we're on ppc64le

[Michael Ellerman]

Some of our selftests have only been tested on ppc64le and crash or
behave weirdly on ppc64/ppc32. So add a helper for checking the UTS
machine.

Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
---
 tools/testing/selftests/powerpc/include/utils.h |  2 ++
 tools/testing/selftests/powerpc/utils.c         | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/tools/testing/selftests/powerpc/include/utils.h b/tools/testing/selftests/powerpc/include/utils.h
index 735815b3ad7f..c58c370828b4 100644
--- a/tools/testing/selftests/powerpc/include/utils.h
+++ b/tools/testing/selftests/powerpc/include/utils.h
@@ -48,6 +48,8 @@ static inline bool have_hwcap2(unsigned long ftr2)
 }
 #endif
 
+bool is_ppc64le(void);
+
 /* Yes, this is evil */
 #define FAIL_IF(x)						\
 do {								\
diff --git a/tools/testing/selftests/powerpc/utils.c b/tools/testing/selftests/powerpc/utils.c
index d46916867a6f..aa8fc1e6365b 100644
--- a/tools/testing/selftests/powerpc/utils.c
+++ b/tools/testing/selftests/powerpc/utils.c
@@ -11,8 +11,10 @@
 #include <link.h>
 #include <sched.h>
 #include <stdio.h>
+#include <string.h>
 #include <sys/stat.h>
 #include <sys/types.h>
+#include <sys/utsname.h>
 #include <unistd.h>
 
 #include "utils.h"
@@ -104,3 +106,18 @@ int pick_online_cpu(void)
 	printf("No cpus in affinity mask?!\n");
 	return -1;
 }
+
+bool is_ppc64le(void)
+{
+	struct utsname uts;
+	int rc;
+
+	errno = 0;
+	rc = uname(&uts);
+	if (rc) {
+		perror("uname");
+		return false;
+	}
+
+	return strcmp(uts.machine, "ppc64le") == 0;
+}
-- 
2.14.1