diff --git a/compiler/rustc_query_system/src/ich/hcx.rs b/compiler/rustc_query_system/src/ich/hcx.rs
index d3e5189ce76..f2e935c59fc 100644
--- a/compiler/rustc_query_system/src/ich/hcx.rs
+++ b/compiler/rustc_query_system/src/ich/hcx.rs
@@ -178,12 +178,14 @@ impl<'a> StableHashingContext<'a> {
 }
 
 impl<'a> HashStable<StableHashingContext<'a>> for ast::NodeId {
+    #[inline]
     fn hash_stable(&self, _: &mut StableHashingContext<'a>, _: &mut StableHasher) {
         panic!("Node IDs should not appear in incremental state");
     }
 }
 
 impl<'a> rustc_span::HashStableContext for StableHashingContext<'a> {
+    #[inline]
     fn hash_spans(&self) -> bool {
         self.hash_spans
     }
@@ -198,6 +200,7 @@ impl<'a> rustc_span::HashStableContext for StableHashingContext<'a> {
         self.definitions.def_span(def_id)
     }
 
+    #[inline]
     fn span_data_to_lines_and_cols(
         &mut self,
         span: &SpanData,
diff --git a/compiler/rustc_query_system/src/ich/impls_hir.rs b/compiler/rustc_query_system/src/ich/impls_hir.rs
index 3c3e7e0d173..04eb263a977 100644
--- a/compiler/rustc_query_system/src/ich/impls_hir.rs
+++ b/compiler/rustc_query_system/src/ich/impls_hir.rs
@@ -26,6 +26,7 @@ impl<'ctx> rustc_hir::HashStableContext for StableHashingContext<'ctx> {
         }
     }
 
+    #[inline]
     fn hash_body_id(&mut self, id: hir::BodyId, hasher: &mut StableHasher) {
         let hcx = self;
         if hcx.hash_bodies() {
@@ -33,6 +34,7 @@ impl<'ctx> rustc_hir::HashStableContext for StableHashingContext<'ctx> {
         }
     }
 
+    #[inline]
     fn hash_reference_to_item(&mut self, id: hir::HirId, hasher: &mut StableHasher) {
         let hcx = self;
 
@@ -41,6 +43,7 @@ impl<'ctx> rustc_hir::HashStableContext for StableHashingContext<'ctx> {
         })
     }
 
+    #[inline]
     fn hash_hir_mod(&mut self, module: &hir::Mod<'_>, hasher: &mut StableHasher) {
         let hcx = self;
         let hir::Mod { inner: ref inner_span, ref item_ids } = *module;
@@ -103,6 +106,7 @@ impl<'ctx> rustc_hir::HashStableContext for StableHashingContext<'ctx> {
         }
     }
 
+    #[inline]
     fn hash_hir_item_like<F: FnOnce(&mut Self)>(&mut self, f: F) {
         let prev_hash_node_ids = self.node_id_hashing_mode;
         self.node_id_hashing_mode = NodeIdHashingMode::Ignore;
@@ -114,6 +118,7 @@ impl<'ctx> rustc_hir::HashStableContext for StableHashingContext<'ctx> {
 }
 
 impl<'a> HashStable<StableHashingContext<'a>> for hir::Body<'_> {
+    #[inline]
     fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
         let hir::Body { params, value, generator_kind } = self;
 
diff --git a/compiler/rustc_session/src/cstore.rs b/compiler/rustc_session/src/cstore.rs
index 4b93a3e8e83..9d6bd201039 100644
--- a/compiler/rustc_session/src/cstore.rs
+++ b/compiler/rustc_session/src/cstore.rs
@@ -28,6 +28,7 @@ pub struct CrateSource {
 }
 
 impl CrateSource {
+    #[inline]
     pub fn paths(&self) -> impl Iterator<Item = &PathBuf> {
         self.dylib.iter().chain(self.rlib.iter()).chain(self.rmeta.iter()).map(|p| &p.0)
     }
@@ -47,6 +48,7 @@ pub enum CrateDepKind {
 }
 
 impl CrateDepKind {
+    #[inline]
     pub fn macros_only(self) -> bool {
         match self {
             CrateDepKind::MacrosOnly => true,
@@ -122,10 +124,12 @@ impl ExternCrate {
     /// If true, then this crate is the crate named by the extern
     /// crate referenced above. If false, then this crate is a dep
     /// of the crate.
+    #[inline]
     pub fn is_direct(&self) -> bool {
         self.dependency_of == LOCAL_CRATE
     }
 
+    #[inline]
     pub fn rank(&self) -> impl PartialOrd {
         // Prefer:
         // - direct extern crate to indirect