[PATCH v2] proc: fixup map_files test on arm

[Alexey Dobriyan]

https://bugs.linaro.org/show_bug.cgi?id=3782

Turns out arm doesn't allow to map address 0, so try minimum virtual
address instead.

Reported-by: Rafael David Tinoco <rafael.tin...@linaro.org>
Tested-by: Rafael David Tinoco <rafael.tin...@linaro.org>
Signed-off-by: Alexey Dobriyan <adobri...@gmail.com>
---

 tools/testing/selftests/proc/proc-self-map-files-002.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/tools/testing/selftests/proc/proc-self-map-files-002.c
+++ b/tools/testing/selftests/proc/proc-self-map-files-002.c
@@ -13,7 +13,7 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
-/* Test readlink /proc/self/map_files/... with address 0. */
+/* Test readlink /proc/self/map_files/... with minimum address. */
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -47,6 +47,11 @@ static void fail(const char *fmt, unsigned long a, unsigned 
long b)
 int main(void)
 {
        const unsigned int PAGE_SIZE = sysconf(_SC_PAGESIZE);
+#ifdef __arm__
+       unsigned long va = 2 * PAGE_SIZE;
+#else
+       unsigned long va = 0;
+#endif
        void *p;
        int fd;
        unsigned long a, b;
@@ -55,7 +60,7 @@ int main(void)
        if (fd == -1)
                return 1;
 
-       p = mmap(NULL, PAGE_SIZE, PROT_NONE, MAP_PRIVATE|MAP_FILE|MAP_FIXED, 
fd, 0);
+       p = mmap((void *)va, PAGE_SIZE, PROT_NONE, 
MAP_PRIVATE|MAP_FILE|MAP_FIXED, fd, 0);
        if (p == MAP_FAILED) {
                if (errno == EPERM)
                        return 2;