Subject: [RFC v6 50/62] selftest/vm: introduce two arch independent abstraction

From: Ram Pai <[email-masked]>
Date: Sat, 15 Jul 2017 20:56:52 -0700

open_hugepage_file() <- opens the huge page file
get_start_key() <--  provides the first non-reserved key.

Signed-off-by: Ram Pai <[email-masked]>
---
 tools/testing/selftests/vm/pkey-helpers.h    |   11 +++++++++++
 tools/testing/selftests/vm/protection_keys.c |    6 +++---
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/vm/pkey-helpers.h b/tools/testing/selftests/vm/pkey-helpers.h
index f50b5f2..5211019 100644
--- a/tools/testing/selftests/vm/pkey-helpers.h
+++ b/tools/testing/selftests/vm/pkey-helpers.h
@@ -300,3 +300,14 @@ static inline void __page_o_noops(void)
 	}					\
 } while (0)
 #define raw_assert(cond) assert(cond)
+
+static inline int open_hugepage_file(int flag)
+{
+	return open("/sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages",
+		 O_RDONLY);
+}
+
+static inline int get_start_key(void)
+{
+	return 1;
+}
diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
index 1c8ef39..20bab6d 100644
--- a/tools/testing/selftests/vm/protection_keys.c
+++ b/tools/testing/selftests/vm/protection_keys.c
@@ -809,7 +809,7 @@ void setup_hugetlbfs(void)
 	 * Now go make sure that we got the pages and that they
 	 * are 2M pages.  Someone might have made 1G the default.
 	 */
-	fd = open("/sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages", O_RDONLY);
+	fd = open_hugepage_file(O_RDONLY);
 	if (fd < 0) {
 		perror("opening sysfs 2M hugetlb config");
 		return;
@@ -1087,10 +1087,10 @@ void test_kernel_gup_write_to_write_disabled_region(int *ptr, u16 pkey)
 void test_pkey_syscalls_on_non_allocated_pkey(int *ptr, u16 pkey)
 {
 	int err;
-	int i;
+	int i = get_start_key();
 
 	/* Note: 0 is the default pkey, so don't mess with it */
-	for (i = 1; i < NR_PKEYS; i++) {
+	for (; i < NR_PKEYS; i++) {
 		if (pkey == i)
 			continue;
 
-- 
1.7.1