[PATCH v2] selftests/mm/cow: Modify the incorrect checking parameters

[Hao Ge <hao.ge@linux.dev>]

From: Hao Ge <gehao@kylinos.cn>

In the cow.c,some error handle have passed incorrect
parameters. It should be "smem", but it was mistakenly
written as "mem".

Let's fix it.

Fixes: f8664f3c4a08 ("selftests/vm: cow: basic COW tests for non-anonymous pages")
Signed-off-by: Hao Ge <gehao@kylinos.cn>
---
v2: Anshuman pointed out that the error is not limited to the run_with_memfd_hugetlb function;
    there are other places where it occurs as well.
    Therefore, let's fix it all together.
    Similarly, Update the Fix tag to be accurate.
---
 tools/testing/selftests/mm/cow.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/mm/cow.c b/tools/testing/selftests/mm/cow.c
index 32c6ccc2a6be..c52c93996ba1 100644
--- a/tools/testing/selftests/mm/cow.c
+++ b/tools/testing/selftests/mm/cow.c
@@ -1482,7 +1482,7 @@ static void run_with_zeropage(non_anon_test_fn fn, const char *desc)
 	}
 
 	smem = mmap(NULL, pagesize, PROT_READ, MAP_PRIVATE | MAP_ANON, -1, 0);
-	if (mem == MAP_FAILED) {
+	if (smem == MAP_FAILED) {
 		ksft_test_result_fail("mmap() failed\n");
 		goto munmap;
 	}
@@ -1583,7 +1583,7 @@ static void run_with_memfd(non_anon_test_fn fn, const char *desc)
 		goto close;
 	}
 	smem = mmap(NULL, pagesize, PROT_READ, MAP_SHARED, fd, 0);
-	if (mem == MAP_FAILED) {
+	if (smem == MAP_FAILED) {
 		ksft_test_result_fail("mmap() failed\n");
 		goto munmap;
 	}
@@ -1634,7 +1634,7 @@ static void run_with_tmpfile(non_anon_test_fn fn, const char *desc)
 		goto close;
 	}
 	smem = mmap(NULL, pagesize, PROT_READ, MAP_SHARED, fd, 0);
-	if (mem == MAP_FAILED) {
+	if (smem == MAP_FAILED) {
 		ksft_test_result_fail("mmap() failed\n");
 		goto munmap;
 	}
@@ -1684,7 +1684,7 @@ static void run_with_memfd_hugetlb(non_anon_test_fn fn, const char *desc,
 		goto close;
 	}
 	smem = mmap(NULL, hugetlbsize, PROT_READ, MAP_SHARED, fd, 0);
-	if (mem == MAP_FAILED) {
+	if (smem == MAP_FAILED) {
 		ksft_test_result_fail("mmap() failed\n");
 		goto munmap;
 	}
@@ -1696,7 +1696,7 @@ static void run_with_memfd_hugetlb(non_anon_test_fn fn, const char *desc,
 	fn(mem, smem, hugetlbsize);
 munmap:
 	munmap(mem, hugetlbsize);
-	if (mem != MAP_FAILED)
+	if (smem != MAP_FAILED)
 		munmap(smem, hugetlbsize);
 close:
 	close(fd);
-- 
2.25.1