diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 935462b022f3b..0993a366d6014 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -195,6 +195,18 @@ jobs:
             env:
               RUST_LIBC_UNSTABLE_GNU_FILE_OFFSET_BITS: 64
             artifact-tag: offset-bits64
+          - target: aarch64-unknown-linux-musl
+            env:
+              RUST_LIBC_UNSTABLE_MUSL_V1_2_3: 1
+          - target: arm-unknown-linux-musleabihf
+            env:
+              RUST_LIBC_UNSTABLE_MUSL_V1_2_3: 1
+          - target: i686-unknown-linux-musl
+            env:
+              RUST_LIBC_UNSTABLE_MUSL_V1_2_3: 1
+          - target: loongarch64-unknown-linux-musl
+            env:
+              RUST_LIBC_UNSTABLE_MUSL_V1_2_3: 1
           # FIXME(ppc): SIGILL running tests, see
           # https://github.com/rust-lang/libc/pull/4254#issuecomment-2636288713
           # - target: powerpc-unknown-linux-gnu
diff --git a/build.rs b/build.rs
index 5762df5419d76..27ec5f3b7aa5f 100644
--- a/build.rs
+++ b/build.rs
@@ -21,6 +21,7 @@ const ALLOWED_CFGS: &[&str] = &[
     "libc_ctest",
     // Corresponds to `__USE_TIME_BITS64` in UAPI
     "linux_time_bits64",
+    "musl_v1_2_3"
 ];
 
 // Extra values to allow for check-cfg.
@@ -85,6 +86,13 @@ fn main() {
         _ => (),
     }
 
+    let musl_v1_2_3 = env::var("RUST_LIBC_UNSTABLE_MUSL_V1_2_3").is_ok();
+    println!("cargo:rerun-if-env-changed=RUST_LIBC_UNSTABLE_MUSL_V1_2_3");
+    // loongarch64 and ohos have already updated
+    if musl_v1_2_3 || target_os == "loongarch64" || target_env == "ohos" {
+        // FIXME(musl): enable time64 api as well
+        set_cfg("musl_v1_2_3");
+    }
     let linux_time_bits64 = env::var("RUST_LIBC_UNSTABLE_LINUX_TIME_BITS64").is_ok();
     println!("cargo:rerun-if-env-changed=RUST_LIBC_UNSTABLE_LINUX_TIME_BITS64");
     if linux_time_bits64 {
diff --git a/ci/install-musl.sh b/ci/install-musl.sh
index 416874d916f3e..d3752a900ba6d 100755
--- a/ci/install-musl.sh
+++ b/ci/install-musl.sh
@@ -10,14 +10,14 @@ case ${1} in
         musl_version=1.2.5
         ;;
     *)
-        musl_version=1.1.24
+        [ -n "${RUST_LIBC_UNSTABLE_MUSL_V1_2_3:-}" ] && musl_version=1.2.3 || musl_version=1.1.24
         ;;
 esac
 
 musl="musl-${musl_version}"
 
 # Download, configure, build, and install musl:
-curl --retry 5 https://www.musl-libc.org/releases/${musl}.tar.gz | tar xzf -
+curl --retry 5 "https://www.musl-libc.org/releases/${musl}.tar.gz" | tar xzf -
 
 cd "$musl"
 case ${1} in
diff --git a/libc-test/build.rs b/libc-test/build.rs
index d09044e42332e..d003f9c5640ab 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -3648,7 +3648,6 @@ fn test_linux(target: &str) {
     let x32 = target.contains("x32");
     let x86_32 = target.contains("i686");
     let x86_64 = target.contains("x86_64");
-    let aarch64_musl = aarch64 && musl;
     let gnueabihf = target.contains("gnueabihf");
     let x86_64_gnux32 = target.contains("gnux32") && x86_64;
     let riscv64 = target.contains("riscv64");
@@ -3656,7 +3655,13 @@ fn test_linux(target: &str) {
     let wasm32 = target.contains("wasm32");
     let uclibc = target.contains("uclibc");
 
+    let musl_v1_2_3 = env::var("RUST_LIBC_UNSTABLE_MUSL_V1_2_3").is_ok();
+    let old_musl = musl && !musl_v1_2_3;
+
     let mut cfg = ctest_cfg();
+    if musl_v1_2_3 {
+        cfg.cfg("musl_v1_2_3", None);
+    }
     cfg.define("_GNU_SOURCE", None);
     // This macro re-defines fscanf,scanf,sscanf to link to the symbols that are
     // deprecated since glibc >= 2.29. This allows Rust binaries to link against
@@ -4125,6 +4130,9 @@ fn test_linux(target: &str) {
             // FIXME(linux): Requires >= 6.4 kernel headers.
             "ptrace_sud_config" => true,
 
+            // Struct has changed for new musl versions
+            "tcp_info" if old_musl => true,
+
             _ => false,
         }
     });
@@ -4226,9 +4234,9 @@ fn test_linux(target: &str) {
             if name == "PR_GET_MDWE" || name == "PR_MDWE_NO_INHERIT" || name == "PR_MDWE_REFUSE_EXEC_GAIN" || name == "PR_SET_MDWE" {
                 return true;
             }
-            // FIXME(musl): Requires musl >= 1.2
-            if name == "SO_PREFER_BUSY_POLL"
-                || name == "SO_BUSY_POLL_BUDGET"
+            // Requires musl >= 1.2
+            if old_musl && (name == "SO_PREFER_BUSY_POLL"
+                || name == "SO_BUSY_POLL_BUDGET")
             {
                 return true;
             }
@@ -4252,6 +4260,14 @@ fn test_linux(target: &str) {
             {
                         return true;
             }
+            // Values changed in newer musl versions on these arches
+            if old_musl && (riscv64 || x86_64) && name == "O_LARGEFILE" {
+                return true;
+            }
+            // Values changed in newer musl versions
+            if old_musl && name == "RLIM_NLIMITS" {
+                return true;
+            }
         }
         match name {
             // These constants are not available if gnu headers have been included
@@ -4657,18 +4673,18 @@ fn test_linux(target: &str) {
             "getnameinfo" if uclibc => true,
 
             // FIXME(musl): This needs musl 1.2.2 or later.
-            "gettid" if musl => true,
+            "gettid" if old_musl => true,
 
             // Needs glibc 2.33 or later.
             "mallinfo2" => true,
 
-            "reallocarray" if musl => true,
+            "reallocarray" if old_musl => true,
 
             // Not defined in uclibc as of 1.0.34
             "gettid" if uclibc => true,
 
             // Needs musl 1.2.3 or later.
-            "pthread_getname_np" if musl => true,
+            "pthread_getname_np" if old_musl => true,
 
             // pthread_sigqueue uses sigval, which was initially declared
             // as a struct but should be defined as a union. However due
@@ -4762,8 +4778,8 @@ fn test_linux(target: &str) {
             "sched_ss_init_budget",
             "sched_ss_max_repl",
         ].contains(&field) && musl) ||
-        // FIXME(musl): After musl 1.1.24, the type becomes `int` instead of `unsigned short`.
-        (struct_ == "ipc_perm" && field == "__seq" && aarch64_musl) ||
+        // After musl 1.1.24, the type becomes `int` instead of `unsigned short`.
+        (struct_ == "ipc_perm" && field == "__seq" && old_musl && aarch64) ||
         // glibc uses unnamed fields here and Rust doesn't support that yet
         (struct_ == "timex" && field.starts_with("__unused")) ||
         // FIXME(linux): It now takes mode_t since glibc 2.31 on some targets.
@@ -4812,8 +4828,8 @@ fn test_linux(target: &str) {
         (struct_ == "statvfs64" && field == "__f_spare") ||
         // the `xsk_tx_metadata_union` field is an anonymous union
         (struct_ == "xsk_tx_metadata" && field == "xsk_tx_metadata_union") ||
-        // FIXME(musl): After musl 1.2.0, the type becomes `int` instead of `long`.
-        (struct_ == "utmpx" && field == "ut_session")
+        // After musl 1.2.0, the type becomes `int` instead of `long`.
+        (old_musl && struct_ == "utmpx" && field == "ut_session")
     });
 
     cfg.skip_roundtrip(move |s| match s {
diff --git a/src/unix/linux_like/linux/arch/generic/mod.rs b/src/unix/linux_like/linux/arch/generic/mod.rs
index ec3179b431f97..75cb7e19375d0 100644
--- a/src/unix/linux_like/linux/arch/generic/mod.rs
+++ b/src/unix/linux_like/linux/arch/generic/mod.rs
@@ -357,9 +357,6 @@ cfg_if! {
         pub const RLIMIT_RTPRIO: c_int = 14;
         pub const RLIMIT_RTTIME: c_int = 15;
         #[deprecated(since = "0.2.64", note = "Not stable across OS versions")]
-        #[cfg(not(target_arch = "loongarch64"))]
-        pub const RLIM_NLIMITS: c_int = 15;
-        #[cfg(target_arch = "loongarch64")]
         pub const RLIM_NLIMITS: c_int = 16;
         #[allow(deprecated)]
         #[deprecated(since = "0.2.64", note = "Not stable across OS versions")]
diff --git a/src/unix/linux_like/linux/arch/mips/mod.rs b/src/unix/linux_like/linux/arch/mips/mod.rs
index eee7cc81a47e4..1ac2340a27385 100644
--- a/src/unix/linux_like/linux/arch/mips/mod.rs
+++ b/src/unix/linux_like/linux/arch/mips/mod.rs
@@ -349,7 +349,7 @@ cfg_if! {
         pub const RLIMIT_RTPRIO: c_int = 14;
         pub const RLIMIT_RTTIME: c_int = 15;
         #[deprecated(since = "0.2.64", note = "Not stable across OS versions")]
-        pub const RLIM_NLIMITS: c_int = 15;
+        pub const RLIM_NLIMITS: c_int = 16;
         #[allow(deprecated)]
         #[deprecated(since = "0.2.64", note = "Not stable across OS versions")]
         pub const RLIMIT_NLIMITS: c_int = RLIM_NLIMITS;
diff --git a/src/unix/linux_like/linux/arch/powerpc/mod.rs b/src/unix/linux_like/linux/arch/powerpc/mod.rs
index 588b99a2d0f22..23fac9fba6262 100644
--- a/src/unix/linux_like/linux/arch/powerpc/mod.rs
+++ b/src/unix/linux_like/linux/arch/powerpc/mod.rs
@@ -330,7 +330,7 @@ cfg_if! {
         pub const RLIMIT_RTPRIO: c_int = 14;
         pub const RLIMIT_RTTIME: c_int = 15;
         #[deprecated(since = "0.2.64", note = "Not stable across OS versions")]
-        pub const RLIM_NLIMITS: c_int = 15;
+        pub const RLIM_NLIMITS: c_int = 16;
         #[allow(deprecated)]
         #[deprecated(since = "0.2.64", note = "Not stable across OS versions")]
         pub const RLIMIT_NLIMITS: c_int = RLIM_NLIMITS;
diff --git a/src/unix/linux_like/linux/musl/b32/arm/mod.rs b/src/unix/linux_like/linux/musl/b32/arm/mod.rs
index 292585fc3a77a..a79b3fa3729ed 100644
--- a/src/unix/linux_like/linux/musl/b32/arm/mod.rs
+++ b/src/unix/linux_like/linux/musl/b32/arm/mod.rs
@@ -55,6 +55,14 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,
diff --git a/src/unix/linux_like/linux/musl/b32/hexagon.rs b/src/unix/linux_like/linux/musl/b32/hexagon.rs
index 4aab076e1c2d3..b687953554184 100644
--- a/src/unix/linux_like/linux/musl/b32/hexagon.rs
+++ b/src/unix/linux_like/linux/musl/b32/hexagon.rs
@@ -34,6 +34,14 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release"
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,
diff --git a/src/unix/linux_like/linux/musl/b32/mips/mod.rs b/src/unix/linux_like/linux/musl/b32/mips/mod.rs
index e0b35b6c58ea6..3f2b73decbec6 100644
--- a/src/unix/linux_like/linux/musl/b32/mips/mod.rs
+++ b/src/unix/linux_like/linux/musl/b32/mips/mod.rs
@@ -57,6 +57,14 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,
diff --git a/src/unix/linux_like/linux/musl/b32/powerpc.rs b/src/unix/linux_like/linux/musl/b32/powerpc.rs
index 0de40b15094bc..460b2d8fcf0ee 100644
--- a/src/unix/linux_like/linux/musl/b32/powerpc.rs
+++ b/src/unix/linux_like/linux/musl/b32/powerpc.rs
@@ -53,6 +53,14 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,
diff --git a/src/unix/linux_like/linux/musl/b32/x86/mod.rs b/src/unix/linux_like/linux/musl/b32/x86/mod.rs
index 22befbb0b71a5..c42bed66900e4 100644
--- a/src/unix/linux_like/linux/musl/b32/x86/mod.rs
+++ b/src/unix/linux_like/linux/musl/b32/x86/mod.rs
@@ -59,6 +59,14 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,
diff --git a/src/unix/linux_like/linux/musl/b64/aarch64/mod.rs b/src/unix/linux_like/linux/musl/b64/aarch64/mod.rs
index e84b9f563c668..243247edafc46 100644
--- a/src/unix/linux_like/linux/musl/b64/aarch64/mod.rs
+++ b/src/unix/linux_like/linux/musl/b64/aarch64/mod.rs
@@ -60,15 +60,32 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,
         pub cuid: crate::uid_t,
         pub cgid: crate::gid_t,
         pub mode: crate::mode_t,
+
+        #[cfg(musl_v1_2_3)]
+        pub __seq: c_int,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "The type of this field has changed from c_ushort to c_int,
+                we'll follow that change in the future release."
+        )]
         pub __seq: c_ushort,
-        __unused1: c_ulong,
-        __unused2: c_ulong,
+        __unused1: c_long,
+        __unused2: c_long,
     }
 
     pub struct ucontext_t {
diff --git a/src/unix/linux_like/linux/musl/b64/mips64.rs b/src/unix/linux_like/linux/musl/b64/mips64.rs
index 33afe4e46c0d2..5cef57239fda9 100644
--- a/src/unix/linux_like/linux/musl/b64/mips64.rs
+++ b/src/unix/linux_like/linux/musl/b64/mips64.rs
@@ -57,6 +57,14 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,
diff --git a/src/unix/linux_like/linux/musl/b64/powerpc64.rs b/src/unix/linux_like/linux/musl/b64/powerpc64.rs
index fb9653bc881a0..4f3c081fb633c 100644
--- a/src/unix/linux_like/linux/musl/b64/powerpc64.rs
+++ b/src/unix/linux_like/linux/musl/b64/powerpc64.rs
@@ -51,6 +51,14 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,
diff --git a/src/unix/linux_like/linux/musl/b64/riscv64/mod.rs b/src/unix/linux_like/linux/musl/b64/riscv64/mod.rs
index 2b9b394d51d17..cd4ed5c66b0d9 100644
--- a/src/unix/linux_like/linux/musl/b64/riscv64/mod.rs
+++ b/src/unix/linux_like/linux/musl/b64/riscv64/mod.rs
@@ -432,7 +432,7 @@ pub const SYS_landlock_restrict_self: c_long = 446;
 pub const O_APPEND: c_int = 1024;
 pub const O_DIRECT: c_int = 0x4000;
 pub const O_DIRECTORY: c_int = 0x10000;
-pub const O_LARGEFILE: c_int = 0;
+pub const O_LARGEFILE: c_int = 0o100000;
 pub const O_NOFOLLOW: c_int = 0x20000;
 pub const O_CREAT: c_int = 64;
 pub const O_EXCL: c_int = 128;
diff --git a/src/unix/linux_like/linux/musl/b64/s390x.rs b/src/unix/linux_like/linux/musl/b64/s390x.rs
index 8a274f39dfb77..fe9f798d00863 100644
--- a/src/unix/linux_like/linux/musl/b64/s390x.rs
+++ b/src/unix/linux_like/linux/musl/b64/s390x.rs
@@ -10,6 +10,14 @@ pub type __s64 = i64;
 
 s! {
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,
diff --git a/src/unix/linux_like/linux/musl/b64/wasm32/mod.rs b/src/unix/linux_like/linux/musl/b64/wasm32/mod.rs
index 3ac15b8a9349d..3f7a6098297f5 100644
--- a/src/unix/linux_like/linux/musl/b64/wasm32/mod.rs
+++ b/src/unix/linux_like/linux/musl/b64/wasm32/mod.rs
@@ -53,6 +53,14 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,
diff --git a/src/unix/linux_like/linux/musl/b64/x86_64/mod.rs b/src/unix/linux_like/linux/musl/b64/x86_64/mod.rs
index b44b54de65953..c02744c5183dd 100644
--- a/src/unix/linux_like/linux/musl/b64/x86_64/mod.rs
+++ b/src/unix/linux_like/linux/musl/b64/x86_64/mod.rs
@@ -112,6 +112,14 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,
@@ -701,7 +709,7 @@ pub const MAP_32BIT: c_int = 0x0040;
 pub const O_APPEND: c_int = 1024;
 pub const O_DIRECT: c_int = 0x4000;
 pub const O_DIRECTORY: c_int = 0x10000;
-pub const O_LARGEFILE: c_int = 0;
+pub const O_LARGEFILE: c_int = 0o0100000;
 pub const O_NOFOLLOW: c_int = 0x20000;
 pub const O_CREAT: c_int = 64;
 pub const O_EXCL: c_int = 128;
diff --git a/src/unix/linux_like/linux/musl/mod.rs b/src/unix/linux_like/linux/musl/mod.rs
index d3fc09201c730..56bb64cf7675e 100644
--- a/src/unix/linux_like/linux/musl/mod.rs
+++ b/src/unix/linux_like/linux/musl/mod.rs
@@ -303,16 +303,11 @@ s! {
         pub tcpi_probes: u8,
         pub tcpi_backoff: u8,
         pub tcpi_options: u8,
-        /*
-         * FIXME(musl): enable on all targets once musl headers are more up to date
-         */
         /// This contains the bitfields `tcpi_snd_wscale` and `tcpi_rcv_wscale`.
         /// Each is 4 bits.
-        #[cfg(target_arch = "loongarch64")]
         pub tcpi_snd_rcv_wscale: u8,
         /// This contains the bitfields `tcpi_delivery_rate_app_limited` (1 bit) and
         /// `tcpi_fastopen_client_fail` (2 bits).
-        #[cfg(target_arch = "loongarch64")]
         pub tcpi_delivery_fastopen_bitfields: u8,
         pub tcpi_rto: u32,
         pub tcpi_ato: u32,
@@ -358,10 +353,7 @@ s! {
         pub tcpi_bytes_retrans: u64,
         pub tcpi_dsack_dups: u32,
         pub tcpi_reord_seen: u32,
-        // FIXME(musl): enable on all targets once CI musl is updated
-        #[cfg(target_arch = "loongarch64")]
         pub tcpi_rcv_ooopack: u32,
-        #[cfg(target_arch = "loongarch64")]
         pub tcpi_snd_wnd: u32,
     }
 
@@ -440,13 +432,6 @@ s_no_extra_traits! {
         pub __reserved: [c_char; 256],
     }
 
-    // FIXME(musl): musl added paddings and adjusted
-    // layout in 1.2.0 but our CI is still 1.1.24.
-    // So, I'm leaving some fields as cfg for now.
-    // ref. https://github.com/bminor/musl/commit/
-    // 1e7f0fcd7ff2096904fd93a2ee6d12a2392be392
-    //
-    // OpenHarmony uses the musl 1.2 layout.
     pub struct utmpx {
         pub ut_type: c_short,
         __ut_pad1: c_short,
@@ -457,31 +442,24 @@ s_no_extra_traits! {
         pub ut_host: [c_char; 256],
         pub ut_exit: __exit_status,
 
-        #[cfg(target_env = "musl")]
-        #[cfg(not(target_arch = "loongarch64"))]
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "The ABI of this field has changed from c_long to c_int with padding, \
+                we'll follow that change in the future release. See #4443 for more info."
+        )]
         pub ut_session: c_long,
 
-        #[cfg(target_env = "musl")]
-        #[cfg(target_arch = "loongarch64")]
-        pub ut_session: c_int,
-
-        #[cfg(target_env = "musl")]
-        #[cfg(target_arch = "loongarch64")]
+        #[cfg(musl_v1_2_3)]
+        #[cfg(not(target_endian = "little"))]
         __ut_pad2: c_int,
 
-        #[cfg(target_env = "ohos")]
-        #[cfg(target_endian = "little")]
+        #[cfg(musl_v1_2_3)]
         pub ut_session: c_int,
-        #[cfg(target_env = "ohos")]
-        #[cfg(target_endian = "little")]
-        __ut_pad2: c_int,
 
-        #[cfg(target_env = "ohos")]
-        #[cfg(not(target_endian = "little"))]
+        #[cfg(musl_v1_2_3)]
+        #[cfg(target_endian = "little")]
         __ut_pad2: c_int,
-        #[cfg(target_env = "ohos")]
-        #[cfg(not(target_endian = "little"))]
-        pub ut_session: c_int,
 
         pub ut_tv: crate::timeval,
         pub ut_addr_v6: [c_uint; 4],
@@ -557,6 +535,7 @@ cfg_if! {
         }
 
         impl PartialEq for utmpx {
+            #[allow(deprecated)]
             fn eq(&self, other: &utmpx) -> bool {
                 self.ut_type == other.ut_type
                     //&& self.__ut_pad1 == other.__ut_pad1
@@ -581,6 +560,7 @@ cfg_if! {
         impl Eq for utmpx {}
 
         impl fmt::Debug for utmpx {
+            #[allow(deprecated)]
             fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                 f.debug_struct("utmpx")
                     .field("ut_type", &self.ut_type)
@@ -601,6 +581,7 @@ cfg_if! {
         }
 
         impl hash::Hash for utmpx {
+            #[allow(deprecated)]
             fn hash<H: hash::Hasher>(&self, state: &mut H) {
                 self.ut_type.hash(state);
                 //self.__ut_pad1.hash(state);