[PATCH] selftests/landlock:Fix two build issues

[Hu Yadi]

From: "Hu.Yadi" <hu.yadi@xxxxxxx>

Two issues comes up  while building selftest/landlock:

the first one is as to gettid

net_test.c: In function ‘set_service’:
net_test.c:91:45: warning: implicit declaration of function ‘gettid’; did you mean ‘getgid’? [-Wimplicit-function-declaration]
    "_selftests-landlock-net-tid%d-index%d", gettid(),
                                             ^~~~~~
                                             getgid
net_test.c:(.text+0x4e0): undefined reference to `gettid'

the second is compiler error
gcc -Wall -O2 -isystem   fs_test.c -lcap -o /home/linux/tools/testing/selftests/landlock/fs_test
fs_test.c:4575:9: error: initializer element is not constant
  .mnt = mnt_tmp,
         ^~~~~~~

this patch is to fix them

Signed-off-by: Hu.Yadi <hu.yadi@xxxxxxx>
Suggested-by: Jiao <jiaoxupo@xxxxxxx>
Reviewed-by:Berlin <berlin@xxxxxxx>
---
 tools/testing/selftests/landlock/fs_test.c  | 5 ++++-
 tools/testing/selftests/landlock/net_test.c | 3 +--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/landlock/fs_test.c b/tools/testing/selftests/landlock/fs_test.c
index 18e1f86a6234..93eb40a09073 100644
--- a/tools/testing/selftests/landlock/fs_test.c
+++ b/tools/testing/selftests/landlock/fs_test.c
@@ -4572,7 +4572,10 @@ FIXTURE_VARIANT(layout3_fs)
 /* clang-format off */
 FIXTURE_VARIANT_ADD(layout3_fs, tmpfs) {
 	/* clang-format on */
-	.mnt = mnt_tmp,
+	.mnt = {
+		.type = "tmpfs",
+        	.data = "size=4m,mode=700",
+	},
 	.file_path = file1_s1d1,
 };
 
diff --git a/tools/testing/selftests/landlock/net_test.c b/tools/testing/selftests/landlock/net_test.c
index 929e21c4db05..8fb357de8c55 100644
--- a/tools/testing/selftests/landlock/net_test.c
+++ b/tools/testing/selftests/landlock/net_test.c
@@ -18,7 +18,6 @@
 #include <sys/prctl.h>
 #include <sys/socket.h>
 #include <sys/un.h>
-
 #include "common.h"
 
 const short sock_port_start = (1 << 10);
@@ -88,7 +87,7 @@ static int set_service(struct service_fixture *const srv,
 	case AF_UNIX:
 		srv->unix_addr.sun_family = prot.domain;
 		sprintf(srv->unix_addr.sun_path,
-			"_selftests-landlock-net-tid%d-index%d", gettid(),
+			"_selftests-landlock-net-tid%ld-index%d", syscall(SYS_gettid),
 			index);
 		srv->unix_addr_len = SUN_LEN(&srv->unix_addr);
 		srv->unix_addr.sun_path[0] = '\0';
-- 
2.23.0