Auto merge of #145074 - tgross35:rollup-0tillrm, r=tgross35

Rollup of 9 pull requests

Successful merges:

 - rust-lang/rust#144705 (compiler-builtins: plumb LSE support for aarch64 on linux/gnu when optimized-compiler-builtins not enabled)
 - rust-lang/rust#144857 (Port `#[allow_internal_unsafe]` to the new attribute system)
 - rust-lang/rust#144900 (Stabilize `unsigned_signed_diff` feature)
 - rust-lang/rust#144903 (Rename `begin_panic_handler` to `panic_handler`)
 - rust-lang/rust#144974 (compiler-builtins subtree update)
 - rust-lang/rust#145007 (Fix build/doc/test of error index generator)
 - rust-lang/rust#145018 (Derive `Hash` for rustc_public types)
 - rust-lang/rust#145045 (doc(library): Fix Markdown in `Iterator::by_ref`)
 - rust-lang/rust#145046 (Fix doc comment of File::try_lock and File::try_lock_shared)

r? `@ghost`
`@rustbot` modify labels: rollup

5 files changed, 30 insertions, 4 deletions

diff --git a/library/std/src/fs.rs b/library/std/src/fs.rs
index b3ca118a452..a220a3f56e9 100644
--- a/library/std/src/fs.rs
+++ b/library/std/src/fs.rs
@@ -814,7 +814,7 @@ impl File {
     ///
     /// If this file handle/descriptor, or a clone of it, already holds a lock, the exact behavior
     /// is unspecified and platform dependent, including the possibility that it will deadlock.
-    /// However, if this method returns `Ok(true)`, then it has acquired an exclusive lock.
+    /// However, if this method returns `Ok(())`, then it has acquired an exclusive lock.
     ///
     /// If the file is not open for writing, it is unspecified whether this function returns an error.
     ///
@@ -879,7 +879,7 @@ impl File {
     ///
     /// If this file handle, or a clone of it, already holds a lock, the exact behavior is
     /// unspecified and platform dependent, including the possibility that it will deadlock.
-    /// However, if this method returns `Ok(true)`, then it has acquired a shared lock.
+    /// However, if this method returns `Ok(())`, then it has acquired a shared lock.
     ///
     /// The lock will be released when this file (along with any other file descriptors/handles
     /// duplicated or inherited from it) is closed, or if the [`unlock`] method is called.
diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
index fd06a3b540c..0c537530647 100644
--- a/library/std/src/lib.rs
+++ b/library/std/src/lib.rs
@@ -321,7 +321,6 @@
 #![feature(try_blocks)]
 #![feature(try_trait_v2)]
 #![feature(type_alias_impl_trait)]
-#![feature(unsigned_signed_diff)]
 // tidy-alphabetical-end
 //
 // Library features (core):
diff --git a/library/std/src/panicking.rs b/library/std/src/panicking.rs
index 547906ca7dc..87a3fc80dfa 100644
--- a/library/std/src/panicking.rs
+++ b/library/std/src/panicking.rs
@@ -628,7 +628,7 @@ pub fn panicking() -> bool {
 /// Entry point of panics from the core crate (`panic_impl` lang item).
 #[cfg(not(any(test, doctest)))]
 #[panic_handler]
-pub fn begin_panic_handler(info: &core::panic::PanicInfo<'_>) -> ! {
+pub fn panic_handler(info: &core::panic::PanicInfo<'_>) -> ! {
     struct FormatStringPayload<'a> {
         inner: &'a core::panic::PanicMessage<'a>,
         string: Option<String>,
diff --git a/library/std/src/sys/configure_builtins.rs b/library/std/src/sys/configure_builtins.rs
new file mode 100644
index 00000000000..9d776b778dc
--- /dev/null
+++ b/library/std/src/sys/configure_builtins.rs
@@ -0,0 +1,22 @@
+/// Hook into .init_array to enable LSE atomic operations at startup, if
+/// supported.
+#[cfg(all(target_arch = "aarch64", target_os = "linux", not(feature = "compiler-builtins-c")))]
+#[used]
+#[unsafe(link_section = ".init_array.90")]
+static RUST_LSE_INIT: extern "C" fn() = {
+    extern "C" fn init_lse() {
+        use crate::arch;
+
+        // This is provided by compiler-builtins::aarch64_linux.
+        unsafe extern "C" {
+            fn __rust_enable_lse();
+        }
+
+        if arch::is_aarch64_feature_detected!("lse") {
+            unsafe {
+                __rust_enable_lse();
+            }
+        }
+    }
+    init_lse
+};
diff --git a/library/std/src/sys/mod.rs b/library/std/src/sys/mod.rs
index f9a02b522e5..8ec0a0e3302 100644
--- a/library/std/src/sys/mod.rs
+++ b/library/std/src/sys/mod.rs
@@ -1,5 +1,10 @@
 #![allow(unsafe_op_in_unsafe_fn)]
 
+/// The configure builtins provides runtime support compiler-builtin features
+/// which require dynamic intialization to work as expected, e.g. aarch64
+/// outline-atomics.
+mod configure_builtins;
+
 /// The PAL (platform abstraction layer) contains platform-specific abstractions
 /// for implementing the features in the other submodules, e.g. UNIX file
 /// descriptors.