don't reexport atomic::ordering via rustc_data_structures, use std import

compiler/rustc_data_structures/src/sync.rs

@@ -56,9 +56,6 @@ mod parallel;
 pub use parallel::scope;
 pub use parallel::{join, par_for_each_in, par_map, parallel_guard, try_par_for_each_in};
 
-pub use std::sync::atomic::Ordering;
-pub use std::sync::atomic::Ordering::SeqCst;
-
 pub use vec::{AppendOnlyIndexVec, AppendOnlyVec};
 
 mod vec;
@@ -67,8 +64,7 @@ mod freeze;
 pub use freeze::{FreezeLock, FreezeReadGuard, FreezeWriteGuard};
 
 mod mode {
-    use super::Ordering;
-    use std::sync::atomic::AtomicU8;
+    use std::sync::atomic::{AtomicU8, Ordering};
 
     const UNINITIALIZED: u8 = 0;
     const DYN_NOT_THREAD_SAFE: u8 = 1;
@@ -113,6 +109,7 @@ cfg_match! {
     cfg(not(parallel_compiler)) => {
         use std::ops::Add;
         use std::cell::Cell;
+        use std::sync::atomic::Ordering;
 
         pub unsafe auto trait Send {}
         pub unsafe auto trait Sync {}

compiler/rustc_driver_impl/src/lib.rs

@@ -25,7 +25,6 @@ use rustc_codegen_ssa::{traits::CodegenBackend, CodegenErrors, CodegenResults};
 use rustc_data_structures::profiling::{
     get_resident_set_size, print_time_passes_entry, TimePassesFormat,
 };
-use rustc_data_structures::sync::SeqCst;
 use rustc_errors::registry::{InvalidErrorCode, Registry};
 use rustc_errors::{markdown, ColorConfig};
 use rustc_errors::{DiagCtxt, ErrorGuaranteed, PResult};
@@ -476,7 +475,7 @@ fn run_compiler(
             eprintln!(
                 "Fuel used by {}: {}",
                 sess.opts.unstable_opts.print_fuel.as_ref().unwrap(),
-                sess.print_fuel.load(SeqCst)
+                sess.print_fuel.load(Ordering::SeqCst)
             );
         }
 

compiler/rustc_query_impl/src/plumbing.rs

@@ -69,7 +69,7 @@ impl QueryContext for QueryCtxt<'_> {
     fn next_job_id(self) -> QueryJobId {
         QueryJobId(
             NonZeroU64::new(
-                self.query_system.jobs.fetch_add(1, rustc_data_structures::sync::Ordering::Relaxed),
+                self.query_system.jobs.fetch_add(1, std::sync::atomic::Ordering::Relaxed),
             )
             .unwrap(),
         )

compiler/rustc_query_system/src/dep_graph/graph.rs

@@ -4,7 +4,7 @@ use rustc_data_structures::profiling::{EventId, QueryInvocationId, SelfProfilerR
 use rustc_data_structures::sharded::{self, Sharded};
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_data_structures::steal::Steal;
-use rustc_data_structures::sync::{AtomicU32, AtomicU64, Lock, Lrc, Ordering};
+use rustc_data_structures::sync::{AtomicU32, AtomicU64, Lock, Lrc};
 use rustc_data_structures::unord::UnordMap;
 use rustc_index::IndexVec;
 use rustc_serialize::opaque::{FileEncodeResult, FileEncoder};
@@ -13,7 +13,7 @@ use std::collections::hash_map::Entry;
 use std::fmt::Debug;
 use std::hash::Hash;
 use std::marker::PhantomData;
-use std::sync::atomic::Ordering::Relaxed;
+use std::sync::atomic::Ordering;
 
 use super::query::DepGraphQuery;
 use super::serialized::{GraphEncoder, SerializedDepGraph, SerializedDepNodeIndex};
@@ -476,7 +476,7 @@ impl<D: Deps> DepGraph<D> {
                 let task_deps = &mut *task_deps;
 
                 if cfg!(debug_assertions) {
-                    data.current.total_read_count.fetch_add(1, Relaxed);
+                    data.current.total_read_count.fetch_add(1, Ordering::Relaxed);
                 }
 
                 // As long as we only have a low number of reads we can avoid doing a hash
@@ -506,7 +506,7 @@ impl<D: Deps> DepGraph<D> {
                         }
                     }
                 } else if cfg!(debug_assertions) {
-                    data.current.total_duplicate_read_count.fetch_add(1, Relaxed);
+                    data.current.total_duplicate_read_count.fetch_add(1, Ordering::Relaxed);
                 }
             })
         }
@@ -976,8 +976,8 @@ impl<D: Deps> DepGraph<D> {
     pub fn print_incremental_info(&self) {
         if let Some(data) = &self.data {
             data.current.encoder.borrow().print_incremental_info(
-                data.current.total_read_count.load(Relaxed),
-                data.current.total_duplicate_read_count.load(Relaxed),
+                data.current.total_read_count.load(Ordering::Relaxed),
+                data.current.total_duplicate_read_count.load(Ordering::Relaxed),
             )
         }
     }
@@ -992,7 +992,7 @@ impl<D: Deps> DepGraph<D> {
 
     pub(crate) fn next_virtual_depnode_index(&self) -> DepNodeIndex {
         debug_assert!(self.data.is_none());
-        let index = self.virtual_dep_node_index.fetch_add(1, Relaxed);
+        let index = self.virtual_dep_node_index.fetch_add(1, Ordering::Relaxed);
         DepNodeIndex::from_u32(index)
     }
 }

compiler/rustc_session/src/session.rs

@@ -14,9 +14,7 @@ use rustc_data_structures::flock;
 use rustc_data_structures::fx::{FxHashMap, FxIndexSet};
 use rustc_data_structures::jobserver::{self, Client};
 use rustc_data_structures::profiling::{SelfProfiler, SelfProfilerRef};
-use rustc_data_structures::sync::{
-    AtomicU64, DynSend, DynSync, Lock, Lrc, OneThread, Ordering::SeqCst,
-};
+use rustc_data_structures::sync::{AtomicU64, DynSend, DynSync, Lock, Lrc, OneThread};
 use rustc_errors::annotate_snippet_emitter_writer::AnnotateSnippetEmitter;
 use rustc_errors::emitter::{DynEmitter, HumanEmitter, HumanReadableErrorType};
 use rustc_errors::json::JsonEmitter;
@@ -44,7 +42,7 @@ use std::fmt;
 use std::ops::{Div, Mul};
 use std::path::{Path, PathBuf};
 use std::str::FromStr;
-use std::sync::{atomic::AtomicBool, Arc};
+use std::sync::{atomic::AtomicBool, atomic::Ordering::SeqCst, Arc};
 
 struct OptimizationFuel {
     /// If `-zfuel=crate=n` is specified, initially set to `n`, otherwise `0`.