[PATCH] selftests/mm:fix test_prctl_fork_exec return failure

[aigourensheng]

after calling fork() in the test_prctl_fork_exec() function,
the global variable ksm_full_scans_fd is initialized to 0
in the child process upon entering the main function
of ./ksm_functional_tests.
In the function call chain test_child_ksm() ->
__mmap_and_merge_range -> ksm_merge-> ksm_get_full_scans,
start_scans = ksm_get_full_scans() will return an error.
Therefore, the value of ksm_full_scans_fd needs to be
initialized before calling test_child_ksm in the child process.

Signed-off-by: aigourensheng <shechenglong...@gmail.com>
---
 .../selftests/mm/ksm_functional_tests.c       | 38 +++++++++++--------
 1 file changed, 22 insertions(+), 16 deletions(-)

diff --git a/tools/testing/selftests/mm/ksm_functional_tests.c 
b/tools/testing/selftests/mm/ksm_functional_tests.c
index 37de82da9be7..b61803e36d1c 100644
--- a/tools/testing/selftests/mm/ksm_functional_tests.c
+++ b/tools/testing/selftests/mm/ksm_functional_tests.c
@@ -656,12 +656,33 @@ static void test_prot_none(void)
        munmap(map, size);
 }
 
+static void init_global_file_handles(void)
+{
+       mem_fd = open("/proc/self/mem", O_RDWR);
+       if (mem_fd < 0)
+               ksft_exit_fail_msg("opening /proc/self/mem failed\n");
+       ksm_fd = open("/sys/kernel/mm/ksm/run", O_RDWR);
+       if (ksm_fd < 0)
+               ksft_exit_skip("open(\"/sys/kernel/mm/ksm/run\") failed\n");
+       ksm_full_scans_fd = open("/sys/kernel/mm/ksm/full_scans", O_RDONLY);
+       if (ksm_full_scans_fd < 0)
+               ksft_exit_skip("open(\"/sys/kernel/mm/ksm/full_scans\") 
failed\n");
+       pagemap_fd = open("/proc/self/pagemap", O_RDONLY);
+       if (pagemap_fd < 0)
+               ksft_exit_skip("open(\"/proc/self/pagemap\") failed\n");
+       proc_self_ksm_stat_fd = open("/proc/self/ksm_stat", O_RDONLY);
+       proc_self_ksm_merging_pages_fd = open("/proc/self/ksm_merging_pages",
+                                               O_RDONLY);
+       ksm_use_zero_pages_fd = open("/sys/kernel/mm/ksm/use_zero_pages", 
O_RDWR);
+}
+
 int main(int argc, char **argv)
 {
        unsigned int tests = 8;
        int err;
 
        if (argc > 1 && !strcmp(argv[1], FORK_EXEC_CHILD_PRG_NAME)) {
+               init_global_file_handles();
                exit(test_child_ksm());
        }
 
@@ -674,22 +695,7 @@ int main(int argc, char **argv)
 
        pagesize = getpagesize();
 
-       mem_fd = open("/proc/self/mem", O_RDWR);
-       if (mem_fd < 0)
-               ksft_exit_fail_msg("opening /proc/self/mem failed\n");
-       ksm_fd = open("/sys/kernel/mm/ksm/run", O_RDWR);
-       if (ksm_fd < 0)
-               ksft_exit_skip("open(\"/sys/kernel/mm/ksm/run\") failed\n");
-       ksm_full_scans_fd = open("/sys/kernel/mm/ksm/full_scans", O_RDONLY);
-       if (ksm_full_scans_fd < 0)
-               ksft_exit_skip("open(\"/sys/kernel/mm/ksm/full_scans\") 
failed\n");
-       pagemap_fd = open("/proc/self/pagemap", O_RDONLY);
-       if (pagemap_fd < 0)
-               ksft_exit_skip("open(\"/proc/self/pagemap\") failed\n");
-       proc_self_ksm_stat_fd = open("/proc/self/ksm_stat", O_RDONLY);
-       proc_self_ksm_merging_pages_fd = open("/proc/self/ksm_merging_pages",
-                                             O_RDONLY);
-       ksm_use_zero_pages_fd = open("/sys/kernel/mm/ksm/use_zero_pages", 
O_RDWR);
+       init_global_file_handles();
 
        test_unmerge();
        test_unmerge_zero_pages();
-- 
2.17.1