diff --git a/compiler/rustc_ast_lowering/src/asm.rs b/compiler/rustc_ast_lowering/src/asm.rs
index 6585a7de24591..3acca94a54bdf 100644
--- a/compiler/rustc_ast_lowering/src/asm.rs
+++ b/compiler/rustc_ast_lowering/src/asm.rs
@@ -48,6 +48,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
| asm::InlineAsmArch::RiscV32
| asm::InlineAsmArch::RiscV64
| asm::InlineAsmArch::LoongArch64
+ | asm::InlineAsmArch::S390x
);
if !is_stable && !self.tcx.features().asm_experimental_arch() {
feature_err(
diff --git a/src/doc/unstable-book/src/language-features/asm-experimental-arch.md b/src/doc/unstable-book/src/language-features/asm-experimental-arch.md
index 3029c3989c9fa..f00a0fe72876e 100644
--- a/src/doc/unstable-book/src/language-features/asm-experimental-arch.md
+++ b/src/doc/unstable-book/src/language-features/asm-experimental-arch.md
@@ -18,7 +18,6 @@ This feature tracks `asm!` and `global_asm!` support for the following architect
- MSP430
- M68k
- CSKY
-- s390x
- Arm64EC
- SPARC
@@ -52,11 +51,6 @@ This feature tracks `asm!` and `global_asm!` support for the following architect
| M68k | `reg_addr` | `a[0-3]` | `a` |
| CSKY | `reg` | `r[0-31]` | `r` |
| CSKY | `freg` | `f[0-31]` | `f` |
-| s390x | `reg` | `r[0-10]`, `r[12-14]` | `r` |
-| s390x | `reg_addr` | `r[1-10]`, `r[12-14]` | `a` |
-| s390x | `freg` | `f[0-15]` | `f` |
-| s390x | `vreg` | `v[0-31]` | Only clobbers |
-| s390x | `areg` | `a[2-15]` | Only clobbers |
| SPARC | `reg` | `r[2-29]` | `r` |
| SPARC | `yreg` | `y` | Only clobbers |
| Arm64EC | `reg` | `x[0-12]`, `x[15-22]`, `x[25-27]`, `x30` | `r` |
@@ -96,10 +90,6 @@ This feature tracks `asm!` and `global_asm!` support for the following architect
| M68k | `reg_data` | None | `i8`, `i16`, `i32` |
| CSKY | `reg` | None | `i8`, `i16`, `i32` |
| CSKY | `freg` | None | `f32`, |
-| s390x | `reg`, `reg_addr` | None | `i8`, `i16`, `i32`, `i64` |
-| s390x | `freg` | None | `f32`, `f64` |
-| s390x | `vreg` | N/A | Only clobbers |
-| s390x | `areg` | N/A | Only clobbers |
| SPARC | `reg` | None | `i8`, `i16`, `i32`, `i64` (SPARC64 only) |
| SPARC | `yreg` | N/A | Only clobbers |
| Arm64EC | `reg` | None | `i8`, `i16`, `i32`, `f32`, `i64`, `f64` |
@@ -159,8 +149,8 @@ This feature tracks `asm!` and `global_asm!` support for the following architect
| Architecture | Unsupported register | Reason |
| ------------ | --------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| All | `sp`, `r15` (s390x), `r14`/`o6` (SPARC) | The stack pointer must be restored to its original value at the end of an asm code block. |
-| All | `fr` (Hexagon), `fp` (PowerPC), `$fp` (MIPS), `Y` (AVR), `r4` (MSP430), `a6` (M68k), `r11` (s390x), `r30`/`i6` (SPARC), `x29` (Arm64EC) | The frame pointer cannot be used as an input or output. |
+| All | `sp`, `r14`/`o6` (SPARC) | The stack pointer must be restored to its original value at the end of an asm code block. |
+| All | `fr` (Hexagon), `fp` (PowerPC), `$fp` (MIPS), `Y` (AVR), `r4` (MSP430), `a6` (M68k), `r30`/`i6` (SPARC), `x29` (Arm64EC) | The frame pointer cannot be used as an input or output. |
| All | `r19` (Hexagon), `r29` (PowerPC), `r30` (PowerPC), `x19` (Arm64EC) | These are used internally by LLVM as "base pointer" for functions with complex stack frames. |
| MIPS | `$0` or `$zero` | This is a constant zero register which can't be modified. |
| MIPS | `$1` or `$at` | Reserved for assembler. |
@@ -181,8 +171,6 @@ This feature tracks `asm!` and `global_asm!` support for the following architect
| CSKY | `r15` | This is the link register. |
| CSKY | `r[26-30]` | Reserved by its ABI. |
| CSKY | `r31` | This is the TLS register. |
-| s390x | `c[0-15]` | Reserved by the kernel. |
-| s390x | `a[0-1]` | Reserved for system use. |
| SPARC | `r0`/`g0` | This is always zero and cannot be used as inputs or outputs. |
| SPARC | `r1`/`g1` | Used internally by LLVM. |
| SPARC | `r5`/`g5` | Reserved for system. (SPARC32 only) |
@@ -206,9 +194,6 @@ This feature tracks `asm!` and `global_asm!` support for the following architect
| PowerPC | `reg` | None | `0` | None |
| PowerPC | `reg_nonzero` | None | `3` | None |
| PowerPC | `freg` | None | `0` | None |
-| s390x | `reg` | None | `%r0` | None |
-| s390x | `reg_addr` | None | `%r1` | None |
-| s390x | `freg` | None | `%f0` | None |
| SPARC | `reg` | None | `%o0` | None |
| CSKY | `reg` | None | `r0` | None |
| CSKY | `freg` | None | `f0` | None |
@@ -232,8 +217,6 @@ These flags registers must be restored upon exiting the asm block if the `preser
- The status register `r2`.
- M68k
- The condition code register `ccr`.
-- s390x
- - The condition code register `cc`.
- SPARC
- Integer condition codes (`icc` and `xcc`)
- Floating-point condition codes (`fcc[0-3]`)
diff --git a/tests/assembly/asm/s390x-types.rs b/tests/assembly/asm/s390x-types.rs
index e68b18d7aa690..b1522198a087a 100644
--- a/tests/assembly/asm/s390x-types.rs
+++ b/tests/assembly/asm/s390x-types.rs
@@ -4,7 +4,7 @@
//@[s390x] needs-llvm-components: systemz
//@ compile-flags: -Zmerge-functions=disabled
-#![feature(no_core, lang_items, rustc_attrs, repr_simd, asm_experimental_arch)]
+#![feature(no_core, lang_items, rustc_attrs, repr_simd)]
#![crate_type = "rlib"]
#![no_core]
#![allow(asm_sub_register, non_camel_case_types)]
diff --git a/tests/codegen/asm/s390x-clobbers.rs b/tests/codegen/asm/s390x-clobbers.rs
index 45f72206bdfab..56d82b4b04400 100644
--- a/tests/codegen/asm/s390x-clobbers.rs
+++ b/tests/codegen/asm/s390x-clobbers.rs
@@ -3,7 +3,7 @@
//@[s390x] needs-llvm-components: systemz
#![crate_type = "rlib"]
-#![feature(no_core, rustc_attrs, lang_items, asm_experimental_arch)]
+#![feature(no_core, rustc_attrs, lang_items)]
#![no_core]
#[lang = "sized"]