diff mbox series

[v16,10/23] selftests/vm/pkeys: Fix alloc_random_pkey() to make it really random

Message ID c99bd624151d9f93093c4f07011502bc64dedaa1.1579265066.git.sandipan@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series selftests, powerpc, x86: Memory Protection Keys | expand

Commit Message

Sandipan Das Jan. 17, 2020, 12:49 p.m. UTC 
From: Ram Pai <linuxram@us.ibm.com>

alloc_random_pkey() was allocating the same pkey every
time. Not all pkeys were geting tested. This fixes it.

cc: Dave Hansen <dave.hansen@intel.com>
cc: Florian Weimer <fweimer@redhat.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Acked-by: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
---
 tools/testing/selftests/vm/protection_keys.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
index e666b5d2aeeb..8a69866e92fe 100644
--- a/tools/testing/selftests/vm/protection_keys.c
+++ b/tools/testing/selftests/vm/protection_keys.c
@@ -24,6 +24,7 @@ 
 #define _GNU_SOURCE
 #include <errno.h>
 #include <linux/futex.h>
+#include <time.h>
 #include <sys/time.h>
 #include <sys/syscall.h>
 #include <string.h>
@@ -545,10 +546,10 @@  int alloc_random_pkey(void)
 	int nr_alloced = 0;
 	int random_index;
 	memset(alloced_pkeys, 0, sizeof(alloced_pkeys));
+	srand((unsigned int)time(NULL));
 
 	/* allocate every possible key and make a note of which ones we got */
 	max_nr_pkey_allocs = NR_PKEYS;
-	max_nr_pkey_allocs = 1;
 	for (i = 0; i < max_nr_pkey_allocs; i++) {
 		int new_pkey = alloc_pkey();
 		if (new_pkey < 0)