[PATCH 2/3] XXX: Enable asm_experimental_arch for PowerPC asm!()

[Link Mauve]

This is needed to compile the kernel crate, otherwise this error
happens:

error[E0658]: inline assembly is not stable yet on this architecture
  --> ../rust/kernel/sync/barrier.rs:19:14
   |
19 |     unsafe { core::arch::asm!("") };
   |              ^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #93335 <https://github.com/rust-lang/rust/issues/93335> for more information
   = help: add `#![feature(asm_experimental_arch)]` to the crate attributes to enable
   = note: this compiler was built on 2026-03-25; consider upgrading it if it is out of date

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0658`.
---
 rust/kernel/lib.rs     | 3 +++
 scripts/Makefile.build | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs
index d93292d47420..92ccd47dc3ee 100644
--- a/rust/kernel/lib.rs
+++ b/rust/kernel/lib.rs
@@ -47,6 +47,9 @@
 // To be determined.
 #![feature(used_with_arg)]
 //
+// Needed for PowerPC inline assembly.
+#![feature(asm_experimental_arch)]
+//
 // `feature(derive_coerce_pointee)` is expected to become stable. Before Rust
 // 1.84.0, it did not exist, so enable the predecessor features.
 #![cfg_attr(CONFIG_RUSTC_HAS_COERCE_POINTEE, feature(derive_coerce_pointee))]
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 3652b85be545..c7cc21994c5a 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -321,7 +321,7 @@ $(obj)/%.lst: $(obj)/%.c FORCE
 #
 # Please see https://github.com/Rust-for-Linux/linux/issues/2 for details on
 # the unstable features in use.
-rust_allowed_features := asm_const,asm_goto,arbitrary_self_types,lint_reasons,offset_of_nested,raw_ref_op,slice_ptr_len,strict_provenance,used_with_arg
+rust_allowed_features := asm_const,asm_goto,asm_experimental_arch,arbitrary_self_types,lint_reasons,offset_of_nested,raw_ref_op,slice_ptr_len,strict_provenance,used_with_arg
 
 # `--out-dir` is required to avoid temporaries being created by `rustc` in the
 # current working directory, which may be not accessible in the out-of-tree
-- 
2.54.0


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