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Date: Wed, 15 Mar 2017 22:19:26 +0900
From: SeongJae Park <sj38.park@...il.com>
To: shuah@...nel.org
Cc: wei.guo.simon@...il.com, akpm@...ux-foundation.org,
linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
SeongJae Park <sj38.park@...il.com>
Subject: [PATCH] selftests/vm: Set mmap()'s fd as -1 for MAP_ANONYMOUS flag
Man page of mmap() says that portable applications should ensure fd
argument to be -1 if MAP_ANONYMOUS flag is set as below:
```
The mapping is not backed by any file; its contents are initialized to
zero. The fd and offset arguments are ignored; however, some
implementations require fd to be -1 if MAP_ANONYMOUS (or
MAP_ANON) is specified, and portable applications
should ensure this.
```
However, few mmap() calls under selftests/vm/ uses 0 as fd though they
use MAP_ANONYMOUS flag. This commit changes the argument to be -1 as
recommended.
Signed-off-by: SeongJae Park <sj38.park@...il.com>
---
tools/testing/selftests/vm/map_hugetlb.c | 2 +-
tools/testing/selftests/vm/mlock2-tests.c | 12 ++++++------
tools/testing/selftests/vm/on-fault-limit.c | 2 +-
tools/testing/selftests/vm/thuge-gen.c | 2 +-
4 files changed, 9 insertions(+), 9 deletions(-)
diff --git a/tools/testing/selftests/vm/map_hugetlb.c b/tools/testing/selftests/vm/map_hugetlb.c
index addcd6fc1ecc..77687ab59f77 100644
--- a/tools/testing/selftests/vm/map_hugetlb.c
+++ b/tools/testing/selftests/vm/map_hugetlb.c
@@ -62,7 +62,7 @@ int main(void)
void *addr;
int ret;
- addr = mmap(ADDR, LENGTH, PROTECTION, FLAGS, 0, 0);
+ addr = mmap(ADDR, LENGTH, PROTECTION, FLAGS, -1, 0);
if (addr == MAP_FAILED) {
perror("mmap");
exit(1);
diff --git a/tools/testing/selftests/vm/mlock2-tests.c b/tools/testing/selftests/vm/mlock2-tests.c
index ff0cda2b19c9..e5dbc87b4297 100644
--- a/tools/testing/selftests/vm/mlock2-tests.c
+++ b/tools/testing/selftests/vm/mlock2-tests.c
@@ -293,7 +293,7 @@ static int test_mlock_lock()
unsigned long page_size = getpagesize();
map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE,
- MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
+ MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (map == MAP_FAILED) {
perror("test_mlock_locked mmap");
goto out;
@@ -402,7 +402,7 @@ static int test_mlock_onfault()
unsigned long page_size = getpagesize();
map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE,
- MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
+ MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (map == MAP_FAILED) {
perror("test_mlock_locked mmap");
goto out;
@@ -445,7 +445,7 @@ static int test_lock_onfault_of_present()
uint64_t page1_flags, page2_flags;
map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE,
- MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
+ MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (map == MAP_FAILED) {
perror("test_mlock_locked mmap");
goto out;
@@ -492,7 +492,7 @@ static int test_munlockall()
unsigned long page_size = getpagesize();
map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE,
- MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
+ MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (map == MAP_FAILED) {
perror("test_munlockall mmap");
@@ -518,7 +518,7 @@ static int test_munlockall()
munmap(map, 2 * page_size);
map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE,
- MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
+ MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (map == MAP_FAILED) {
perror("test_munlockall second mmap");
@@ -573,7 +573,7 @@ static int test_vma_management(bool call_mlock)
struct vm_boundaries page3;
map = mmap(NULL, 3 * page_size, PROT_READ | PROT_WRITE,
- MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
+ MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (map == MAP_FAILED) {
perror("mmap()");
return ret;
diff --git a/tools/testing/selftests/vm/on-fault-limit.c b/tools/testing/selftests/vm/on-fault-limit.c
index 0ae458f32fdb..7f96a5c2e292 100644
--- a/tools/testing/selftests/vm/on-fault-limit.c
+++ b/tools/testing/selftests/vm/on-fault-limit.c
@@ -26,7 +26,7 @@ static int test_limit(void)
}
map = mmap(NULL, 2 * lims.rlim_max, PROT_READ | PROT_WRITE,
- MAP_PRIVATE | MAP_ANONYMOUS | MAP_POPULATE, 0, 0);
+ MAP_PRIVATE | MAP_ANONYMOUS | MAP_POPULATE, -1, 0);
if (map != MAP_FAILED)
printf("mmap should have failed, but didn't\n");
else {
diff --git a/tools/testing/selftests/vm/thuge-gen.c b/tools/testing/selftests/vm/thuge-gen.c
index 0bc737a75150..88a2ab535e01 100644
--- a/tools/testing/selftests/vm/thuge-gen.c
+++ b/tools/testing/selftests/vm/thuge-gen.c
@@ -146,7 +146,7 @@ void test_mmap(unsigned long size, unsigned flags)
before = read_free(size);
map = mmap(NULL, size*NUM_PAGES, PROT_READ|PROT_WRITE,
- MAP_PRIVATE|MAP_ANONYMOUS|MAP_HUGETLB|flags, 0, 0);
+ MAP_PRIVATE|MAP_ANONYMOUS|MAP_HUGETLB|flags, -1, 0);
if (map == (char *)-1) err("mmap");
memset(map, 0xff, size*NUM_PAGES);
--
2.10.0
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