diff --git a/library/stdarch/crates/core_arch/src/arm_shared/barrier/common.rs b/library/stdarch/crates/core_arch/src/arm_shared/barrier/common.rs
index 0fb35534d169..476a07ffaef9 100644
--- a/library/stdarch/crates/core_arch/src/arm_shared/barrier/common.rs
+++ b/library/stdarch/crates/core_arch/src/arm_shared/barrier/common.rs
@@ -2,10 +2,12 @@
 
 /// Full system is the required shareability domain, reads and writes are the
 /// required access types
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub struct SY;
 
 dmb_dsb!(SY);
 
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 impl super::super::sealed::Isb for SY {
     #[inline(always)]
     unsafe fn __isb(&self) {
diff --git a/library/stdarch/crates/core_arch/src/arm_shared/barrier/cp15.rs b/library/stdarch/crates/core_arch/src/arm_shared/barrier/cp15.rs
index fe540a7d8dc7..ae9ce3c005cd 100644
--- a/library/stdarch/crates/core_arch/src/arm_shared/barrier/cp15.rs
+++ b/library/stdarch/crates/core_arch/src/arm_shared/barrier/cp15.rs
@@ -5,8 +5,10 @@ use crate::arch::asm;
 
 /// Full system is the required shareability domain, reads and writes are the
 /// required access types
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub struct SY;
 
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 impl super::super::sealed::Dmb for SY {
     #[inline(always)]
     unsafe fn __dmb(&self) {
@@ -18,6 +20,7 @@ impl super::super::sealed::Dmb for SY {
     }
 }
 
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 impl super::super::sealed::Dsb for SY {
     #[inline(always)]
     unsafe fn __dsb(&self) {
@@ -29,6 +32,7 @@ impl super::super::sealed::Dsb for SY {
     }
 }
 
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 impl super::super::sealed::Isb for SY {
     #[inline(always)]
     unsafe fn __isb(&self) {
diff --git a/library/stdarch/crates/core_arch/src/arm_shared/barrier/mod.rs b/library/stdarch/crates/core_arch/src/arm_shared/barrier/mod.rs
index 6ccced00e3ce..1956a3240862 100644
--- a/library/stdarch/crates/core_arch/src/arm_shared/barrier/mod.rs
+++ b/library/stdarch/crates/core_arch/src/arm_shared/barrier/mod.rs
@@ -26,6 +26,7 @@ pub use self::cp15::*;
 ))]
 macro_rules! dmb_dsb {
     ($A:ident) => {
+        #[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
         impl super::super::sealed::Dmb for $A {
             #[inline(always)]
             unsafe fn __dmb(&self) {
@@ -33,6 +34,7 @@ macro_rules! dmb_dsb {
             }
         }
 
+        #[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
         impl super::super::sealed::Dsb for $A {
             #[inline(always)]
             unsafe fn __dsb(&self) {
@@ -54,18 +56,21 @@ mod common;
     target_feature = "v7",
     target_feature = "mclass"
 ))]
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub use self::common::*;
 
 #[cfg(any(target_arch = "aarch64", target_feature = "v7",))]
 mod not_mclass;
 
 #[cfg(any(target_arch = "aarch64", target_feature = "v7",))]
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub use self::not_mclass::*;
 
 #[cfg(target_arch = "aarch64")]
 mod v8;
 
 #[cfg(target_arch = "aarch64")]
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub use self::v8::*;
 
 /// Generates a DMB (data memory barrier) instruction or equivalent CP15 instruction.
@@ -79,6 +84,7 @@ pub use self::v8::*;
 ///
 /// The __dmb() intrinsic also acts as a compiler memory barrier of the appropriate type.
 #[inline(always)]
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub unsafe fn __dmb<A>(arg: A)
 where
     A: super::sealed::Dmb,
@@ -94,6 +100,7 @@ where
 ///
 /// The __dsb() intrinsic also acts as a compiler memory barrier of the appropriate type.
 #[inline(always)]
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub unsafe fn __dsb<A>(arg: A)
 where
     A: super::sealed::Dsb,
@@ -115,6 +122,7 @@ where
 /// The only supported argument for the __isb() intrinsic is 15, corresponding to the SY (full
 /// system) scope of the ISB instruction.
 #[inline(always)]
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub unsafe fn __isb<A>(arg: A)
 where
     A: super::sealed::Isb,
diff --git a/library/stdarch/crates/core_arch/src/arm_shared/barrier/not_mclass.rs b/library/stdarch/crates/core_arch/src/arm_shared/barrier/not_mclass.rs
index 385e1d5289a9..3b941b2715ef 100644
--- a/library/stdarch/crates/core_arch/src/arm_shared/barrier/not_mclass.rs
+++ b/library/stdarch/crates/core_arch/src/arm_shared/barrier/not_mclass.rs
@@ -2,42 +2,49 @@
 
 /// Full system is the required shareability domain, writes are the required
 /// access type
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub struct ST;
 
 dmb_dsb!(ST);
 
 /// Inner Shareable is the required shareability domain, reads and writes are
 /// the required access types
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub struct ISH;
 
 dmb_dsb!(ISH);
 
 /// Inner Shareable is the required shareability domain, writes are the required
 /// access type
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub struct ISHST;
 
 dmb_dsb!(ISHST);
 
 /// Non-shareable is the required shareability domain, reads and writes are the
 /// required access types
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub struct NSH;
 
 dmb_dsb!(NSH);
 
 /// Non-shareable is the required shareability domain, writes are the required
 /// access type
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub struct NSHST;
 
 dmb_dsb!(NSHST);
 
 /// Outer Shareable is the required shareability domain, reads and writes are
 /// the required access types
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub struct OSH;
 
 dmb_dsb!(OSH);
 
 /// Outer Shareable is the required shareability domain, writes are the required
 /// access type
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub struct OSHST;
 
 dmb_dsb!(OSHST);
diff --git a/library/stdarch/crates/core_arch/src/arm_shared/barrier/v8.rs b/library/stdarch/crates/core_arch/src/arm_shared/barrier/v8.rs
index db15da805d65..5bf757f9f779 100644
--- a/library/stdarch/crates/core_arch/src/arm_shared/barrier/v8.rs
+++ b/library/stdarch/crates/core_arch/src/arm_shared/barrier/v8.rs
@@ -1,23 +1,27 @@
 /// Full system is the required shareability domain, reads are the required
 /// access type
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub struct LD;
 
 dmb_dsb!(LD);
 
 /// Inner Shareable is the required shareability domain, reads are the required
 /// access type
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub struct ISHLD;
 
 dmb_dsb!(ISHLD);
 
 /// Non-shareable is the required shareability domain, reads are the required
 /// access type
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub struct NSHLD;
 
 dmb_dsb!(NSHLD);
 
 /// Outer Shareable is the required shareability domain, reads are the required
 /// access type
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub struct OSHLD;
 
 dmb_dsb!(OSHLD);
diff --git a/library/stdarch/crates/core_arch/src/arm_shared/mod.rs b/library/stdarch/crates/core_arch/src/arm_shared/mod.rs
index 0bc8cf143da2..ca5b3a646535 100644
--- a/library/stdarch/crates/core_arch/src/arm_shared/mod.rs
+++ b/library/stdarch/crates/core_arch/src/arm_shared/mod.rs
@@ -53,7 +53,7 @@
 // 8, 7 and 6-M are supported via dedicated instructions like DMB. All other arches are supported
 // via CP15 instructions. See Section 10.1 of ACLE
 mod barrier;
-
+#[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
 pub use self::barrier::*;
 
 mod hints;
@@ -102,39 +102,18 @@ pub use self::neon::*;
 pub(crate) mod test_support;
 
 mod sealed {
+    #[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
     pub trait Dmb {
         unsafe fn __dmb(&self);
     }
 
+    #[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
     pub trait Dsb {
         unsafe fn __dsb(&self);
     }
 
+    #[unstable(feature = "stdarch_arm_barrier", issue = "117219")]
     pub trait Isb {
         unsafe fn __isb(&self);
     }
-
-    pub trait Rsr {
-        unsafe fn __rsr(&self) -> u32;
-    }
-
-    pub trait Rsr64 {
-        unsafe fn __rsr64(&self) -> u64;
-    }
-
-    pub trait Rsrp {
-        unsafe fn __rsrp(&self) -> *const u8;
-    }
-
-    pub trait Wsr {
-        unsafe fn __wsr(&self, value: u32);
-    }
-
-    pub trait Wsr64 {
-        unsafe fn __wsr64(&self, value: u64);
-    }
-
-    pub trait Wsrp {
-        unsafe fn __wsrp(&self, value: *const u8);
-    }
 }