Commit dbd4af54 authored by Alexey Dobriyan's avatar Alexey Dobriyan Committed by Linus Torvalds

proc: fixup map_files test on arm

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

Turns out arm doesn't permit mapping address 0, so try minimum virtual
address instead.

Link: http://lkml.kernel.org/r/20181113165446.GA28157@avx2Signed-off-by: default avatarAlexey Dobriyan <adobriyan@gmail.com>
Reported-by: default avatarRafael David Tinoco <rafael.tinoco@linaro.org>
Tested-by: default avatarRafael David Tinoco <rafael.tinoco@linaro.org>
Acked-by: default avatarCyrill Gorcunov <gorcunov@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 8de456cf
......@@ -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;
......
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