diff --git a/libc-test/semver/linux-gnu-s390x.txt b/libc-test/semver/linux-gnu-s390x.txt
new file mode 100644
index 0000000000000..ec90f4184b638
--- /dev/null
+++ b/libc-test/semver/linux-gnu-s390x.txt
@@ -0,0 +1,4 @@
+PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
+PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP
+PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
+sysctl
diff --git a/libc-test/semver/linux-s390x.txt b/libc-test/semver/linux-s390x.txt
index 96be9c25e4f3c..34ebf4da7ab24 100644
--- a/libc-test/semver/linux-s390x.txt
+++ b/libc-test/semver/linux-s390x.txt
@@ -21,9 +21,6 @@ NFT_MSG_DELOBJ
 NFT_MSG_GETOBJ
 NFT_MSG_GETOBJ_RESET
 NFT_MSG_NEWOBJ
-PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
-PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP
-PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
 SIGSTKFLT
 SIGUNUSED
 SO_BSDCOMPAT
@@ -113,6 +110,5 @@ makecontext
 mcontext_t
 setcontext
 swapcontext
-sysctl
 termios2
 ucontext_t
diff --git a/src/unix/linux_like/linux/musl/b64/s390x.rs b/src/unix/linux_like/linux/musl/b64/s390x.rs
index c312505a7d77f..afd5cf4040a28 100644
--- a/src/unix/linux_like/linux/musl/b64/s390x.rs
+++ b/src/unix/linux_like/linux/musl/b64/s390x.rs
@@ -7,6 +7,7 @@ pub type wchar_t = i32;
 pub type greg_t = u64;
 pub type __u64 = u64;
 pub type __s64 = i64;
+pub type statfs64 = statfs;
 
 s! {
     pub struct ipc_perm {
@@ -68,13 +69,27 @@ s! {
         pub st_blocks: crate::blkcnt64_t,
         __unused: [c_long; 3],
     }
+
+    pub struct statfs {
+        pub f_type: c_uint,
+        pub f_bsize: c_uint,
+        pub f_blocks: crate::fsblkcnt_t,
+        pub f_bfree: crate::fsblkcnt_t,
+        pub f_bavail: crate::fsblkcnt_t,
+        pub f_files: crate::fsfilcnt_t,
+        pub f_ffree: crate::fsfilcnt_t,
+        pub f_fsid: crate::fsid_t,
+        pub f_namelen: c_uint,
+        pub f_frsize: c_uint,
+        pub f_flags: c_uint,
+        pub f_spare: [c_uint; 4],
+    }
 }
 
 s_no_extra_traits! {
-    // FIXME(union): This is actually a union.
-    pub struct fpreg_t {
+    pub union fpreg_t {
         pub d: c_double,
-        // f: c_float,
+        pub f: c_float,
     }
 }
 
@@ -715,3 +730,4 @@ pub const SYS_futex_waitv: c_long = 449;
 pub const SYS_set_mempolicy_home_node: c_long = 450;
 pub const SYS_cachestat: c_long = 451;
 pub const SYS_fchmodat2: c_long = 452;
+pub const SYS_mseal: c_long = 462;
diff --git a/src/unix/linux_like/linux/musl/mod.rs b/src/unix/linux_like/linux/musl/mod.rs
index bf2100cc60747..0a4e01ade9fc1 100644
--- a/src/unix/linux_like/linux/musl/mod.rs
+++ b/src/unix/linux_like/linux/musl/mod.rs
@@ -372,8 +372,8 @@ s! {
         pub tcpi_snd_wnd: u32,
     }
 
-    // MIPS implementation is special (see mips arch folders)
-    #[cfg(not(any(target_arch = "mips", target_arch = "mips64")))]
+    // MIPS/s390x implementation is special (see arch folders)
+    #[cfg(not(any(target_arch = "mips", target_arch = "mips64", target_arch = "s390x")))]
     pub struct statfs {
         pub f_type: c_ulong,
         pub f_bsize: c_ulong,
@@ -389,8 +389,8 @@ s! {
         pub f_spare: [c_ulong; 4],
     }
 
-    // MIPS implementation is special (see mips arch folders)
-    #[cfg(not(any(target_arch = "mips", target_arch = "mips64")))]
+    // MIPS/s390x implementation is special (see arch folders)
+    #[cfg(not(any(target_arch = "mips", target_arch = "mips64", target_arch = "s390x")))]
     pub struct statfs64 {
         pub f_type: c_ulong,
         pub f_bsize: c_ulong,