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proc: fixup map_files test on arm

Browse source 
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@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reported-by: Rafael David Tinoco <rafael.tinoco@linaro.org>
Tested-by: Rafael David Tinoco <rafael.tinoco@linaro.org>
Acked-by: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2018-11-30 14:09:53 -08:00 • committed by Linus Torvalds
parent 8de456cf87
commit dbd4af5474
1 changed files with 7 additions and 2 deletions
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9
tools/testing/selftests/proc/proc-self-map-files-002.c
View file

@ -13,7 +13,7 @@
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * 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 <errno.h>
#include <sys/types.h> #include <sys/types.h>
#include <sys/stat.h> #include <sys/stat.h>
@ -47,6 +47,11 @@ static void fail(const char *fmt, unsigned long a, unsigned long b)
int main(void) int main(void)
{ {
const unsigned int PAGE_SIZE = sysconf(_SC_PAGESIZE); const unsigned int PAGE_SIZE = sysconf(_SC_PAGESIZE);
#ifdef __arm__
unsigned long va = 2 * PAGE_SIZE;
#else
unsigned long va = 0;
#endif
void *p; void *p;
int fd; int fd;
unsigned long a, b; unsigned long a, b;
@ -55,7 +60,7 @@ int main(void)
if (fd == -1) if (fd == -1)
return 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 (p == MAP_FAILED) {
if (errno == EPERM) if (errno == EPERM)
return 2; return 2;