sys_open_tree is once defined in filesystems/overlayfs/wrappers.h so before we define it in mount_setattr_test.c we should check if has been previously defined or not. Otherwise it results in the following build error:

make[1]: Nothing to be done for 'all'. CC mount_setattr_test mount_setattr_test.c:176:19: error: redefinition of ‘sys_open_tree’ 176 | static inline int sys_open_tree(int dfd, const char *filename, unsigned int flags) | ^~~~~~~~~~~~~ In file included from mount_setattr_test.c:23: ../filesystems/overlayfs/wrappers.h:59:19: note: previous definition of ‘sys_open_tree’ with type ‘int(int, const char *, unsigned int)’ 59 | static inline int sys_open_tree(int dfd, const char *filename, unsigned int flags) | ^~~~~~~~~~~~~ make[1]: *** [../lib.mk:222: /home/listout/linux/tools/testing/selftests/mount_setattr/mount_setattr_test] Error 1

Signed-off-by: Brahmajit Das listout@listout.xyz --- tools/testing/selftests/mount_setattr/mount_setattr_test.c | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/mount_setattr/mount_setattr_test.c b/tools/testing/selftests/mount_setattr/mount_setattr_test.c index 48a000cabc97..b0798777b822 100644 --- a/tools/testing/selftests/mount_setattr/mount_setattr_test.c +++ b/tools/testing/selftests/mount_setattr/mount_setattr_test.c @@ -173,10 +173,13 @@ static inline int sys_mount_setattr(int dfd, const char *path, unsigned int flag #define AT_RECURSIVE 0x8000 /* Apply to the entire subtree */ #endif

+/* Do not define sys_open_tree if it's already defined in overlayfs/wrappers.h */ +#if !defined(__SELFTEST_OVERLAYFS_WRAPPERS_H__) static inline int sys_open_tree(int dfd, const char *filename, unsigned int flags) { return syscall(__NR_open_tree, dfd, filename, flags); } +#endif

static ssize_t write_nointr(int fd, const void *buf, size_t count) {