Mark always_inline functions inline.

You would think always_inline implies inline, but GCC complains loudly if the always_inline attribute is not also accompanied by the normal inline keyword.

src/core/lib/promise/all_ok.h

@@ -78,7 +78,7 @@ class AllOk {
 // If any fail, cancel the rest and return the failure.
 // If all succeed, return Ok.
 template <typename Result, typename... Promises>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION auto AllOk(Promises... promises) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline auto AllOk(Promises... promises) {
   return promise_detail::AllOk<Result, Promises...>(std::move(promises)...);
 }
 

src/core/lib/promise/cancel_callback.h

@@ -69,8 +69,8 @@ class Handler {
 // completion.
 // Returns a promise with the same result type as main_fn.
 template <typename MainFn, typename CancelFn>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION auto OnCancel(MainFn main_fn,
-                                                   CancelFn cancel_fn) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline auto OnCancel(MainFn main_fn,
+                                                          CancelFn cancel_fn) {
   return [on_cancel =
               cancel_callback_detail::Handler<CancelFn>(std::move(cancel_fn)),
           main_fn = promise_detail::PromiseLike<MainFn>(
@@ -87,8 +87,8 @@ GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION auto OnCancel(MainFn main_fn,
 // resulting promise. If the factory is dropped without being called, cancel_fn
 // is called.
 template <typename MainFn, typename CancelFn>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION auto OnCancelFactory(MainFn main_fn,
-                                                          CancelFn cancel_fn) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline auto OnCancelFactory(
+    MainFn main_fn, CancelFn cancel_fn) {
   return [on_cancel =
               cancel_callback_detail::Handler<CancelFn>(std::move(cancel_fn)),
           main_fn = std::move(main_fn)]() mutable {

src/core/lib/promise/context.h

@@ -106,13 +106,13 @@ class WithContext {
 
 // Return true if a context of type T is currently active.
 template <typename T>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION bool HasContext() {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline bool HasContext() {
   return promise_detail::Context<T>::get() != nullptr;
 }
 
 // Retrieve the current value of a context, or abort if the value is unset.
 template <typename T>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION T* GetContext() {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline T* GetContext() {
   auto* p = promise_detail::Context<T>::get();
   DCHECK_NE(p, nullptr);
   return p;
@@ -120,12 +120,12 @@ GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION T* GetContext() {
 
 // Retrieve the current value of a context, or nullptr if the value is unset.
 template <typename T>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION T* MaybeGetContext() {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline T* MaybeGetContext() {
   return promise_detail::Context<T>::get();
 }
 
 template <typename T>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION void SetContext(T* p) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline void SetContext(T* p) {
   promise_detail::Context<T>::set(p);
 }
 

src/core/lib/promise/detail/promise_factory.h

@@ -125,7 +125,7 @@ GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION
 // Promote a callable() -> T|Poll<T> to a PromiseFactory(A) -> Promise<T>
 // by dropping the argument passed to the factory.
 template <typename A, typename F>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION absl::enable_if_t<
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline absl::enable_if_t<
     !IsVoidCallable<ResultOf<F()>>::value, PromiseLike<RemoveCVRef<F>>>
 PromiseFactoryImpl(F f, A&&) {
   return PromiseLike<F>(std::move(f));
@@ -133,7 +133,7 @@ PromiseFactoryImpl(F f, A&&) {
 
 // Promote a callable() -> T|Poll<T> to a PromiseFactory() -> Promise<T>
 template <typename F>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION absl::enable_if_t<
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline absl::enable_if_t<
     !IsVoidCallable<ResultOf<F()>>::value, PromiseLike<RemoveCVRef<F>>>
 PromiseFactoryImpl(F f) {
   return PromiseLike<F>(std::move(f));
@@ -141,7 +141,7 @@ PromiseFactoryImpl(F f) {
 
 // Given a callable(A) -> Promise<T>, name it a PromiseFactory and use it.
 template <typename A, typename F>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION absl::enable_if_t<
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline absl::enable_if_t<
     IsVoidCallable<ResultOf<F(A)>>::value,
     PromiseLike<decltype(std::declval<F>()(std::declval<A>()))>>
 PromiseFactoryImpl(F&& f, A&& arg) {
@@ -150,7 +150,7 @@ PromiseFactoryImpl(F&& f, A&& arg) {
 
 // Given a callable(A) -> Promise<T>, name it a PromiseFactory and use it.
 template <typename A, typename F>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION absl::enable_if_t<
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline absl::enable_if_t<
     IsVoidCallable<ResultOf<F(A)>>::value,
     PromiseLike<decltype(std::declval<F>()(std::declval<A>()))>>
 PromiseFactoryImpl(F& f, A&& arg) {

src/core/lib/promise/detail/promise_like.h

@@ -64,7 +64,7 @@ struct PollWrapper<Poll<T>> {
 };
 
 template <typename T>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION auto WrapInPoll(T&& x)
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline auto WrapInPoll(T&& x)
     -> decltype(PollWrapper<T>::Wrap(std::forward<T>(x))) {
   return PollWrapper<T>::Wrap(std::forward<T>(x));
 }

src/core/lib/promise/detail/status.h

@@ -30,7 +30,7 @@ namespace promise_detail {
 
 // Convert with a move the input status to an absl::Status.
 template <typename T>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION absl::Status IntoStatus(
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline absl::Status IntoStatus(
     absl::StatusOr<T>* status) {
   return std::move(status->status());
 }
@@ -103,7 +103,7 @@ struct StatusCastImpl<absl::Status, const absl::StatusOr<T>&> {
 // For cases where the status is guaranteed to be a failure (and hence not
 // needing to preserve values) see FailureStatusCast<> below.
 template <typename To, typename From>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION To StatusCast(From&& from) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline To StatusCast(From&& from) {
   return StatusCastImpl<To, From>::Cast(std::forward<From>(from));
 }
 
@@ -127,7 +127,7 @@ struct FailureStatusCastImpl<absl::StatusOr<T>, const absl::Status&> {
 };
 
 template <typename To, typename From>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION To FailureStatusCast(From&& from) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline To FailureStatusCast(From&& from) {
   DCHECK(!IsStatusOk(from));
   return FailureStatusCastImpl<To, From>::Cast(std::forward<From>(from));
 }

src/core/lib/promise/for_each.h

@@ -231,7 +231,8 @@ class ForEach {
 
 /// For each item acquired by calling Reader::Next, run the promise Action.
 template <typename Reader, typename Action>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION for_each_detail::ForEach<Reader, Action>
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline for_each_detail::ForEach<Reader,
+                                                                     Action>
 ForEach(Reader reader, Action action, DebugLocation whence = {}) {
   return for_each_detail::ForEach<Reader, Action>(std::move(reader),
                                                   std::move(action), whence);

src/core/lib/promise/if.h

@@ -33,8 +33,8 @@ namespace grpc_core {
 namespace promise_detail {
 
 template <typename CallPoll, typename T, typename F>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION typename CallPoll::PollResult ChooseIf(
-    CallPoll call_poll, bool result, T* if_true, F* if_false) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline typename CallPoll::PollResult
+ChooseIf(CallPoll call_poll, bool result, T* if_true, F* if_false) {
   if (result) {
     auto promise = if_true->Make();
     return call_poll(promise);
@@ -45,8 +45,9 @@ GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION typename CallPoll::PollResult ChooseIf(
 }
 
 template <typename CallPoll, typename T, typename F>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION typename CallPoll::PollResult ChooseIf(
-    CallPoll call_poll, absl::StatusOr<bool> result, T* if_true, F* if_false) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline typename CallPoll::PollResult
+ChooseIf(CallPoll call_poll, absl::StatusOr<bool> result, T* if_true,
+         F* if_false) {
   if (!result.ok()) {
     return typename CallPoll::PollResult(result.status());
   } else if (*result) {
@@ -200,7 +201,7 @@ class If<bool, T, F> {
 // This makes it safe to capture lambda arguments in the promise factory by
 // reference.
 template <typename C, typename T, typename F>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION promise_detail::If<C, T, F> If(
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline promise_detail::If<C, T, F> If(
     C condition, T if_true, F if_false) {
   return promise_detail::If<C, T, F>(std::move(condition), std::move(if_true),
                                      std::move(if_false));

src/core/lib/promise/join.h

@@ -76,13 +76,13 @@ struct WrapInTuple {
 /// Combinator to run all promises to completion, and return a tuple
 /// of their results.
 template <typename... Promise>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION promise_detail::Join<Promise...> Join(
-    Promise... promises) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline promise_detail::Join<Promise...>
+Join(Promise... promises) {
   return promise_detail::Join<Promise...>(std::move(promises)...);
 }
 
 template <typename F>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION auto Join(F promise) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline auto Join(F promise) {
   return Map(std::move(promise), promise_detail::WrapInTuple{});
 }
 

src/core/lib/promise/loop.h

@@ -141,7 +141,7 @@ class Loop {
 // Expects F returns LoopCtl<T> - if it's Continue, then run the loop again -
 // otherwise yield the returned value as the result of the loop.
 template <typename F>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION promise_detail::Loop<F> Loop(F f) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline promise_detail::Loop<F> Loop(F f) {
   return promise_detail::Loop<F>(std::move(f));
 }
 

src/core/lib/promise/map.h

@@ -68,8 +68,8 @@ class Map {
 // Takes a promise, and a synchronous function to mutate its result, and
 // returns a promise.
 template <typename Promise, typename Fn>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION promise_detail::Map<Promise, Fn> Map(
-    Promise promise, Fn fn) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline promise_detail::Map<Promise, Fn>
+Map(Promise promise, Fn fn) {
   return promise_detail::Map<Promise, Fn>(std::move(promise), std::move(fn));
 }
 
@@ -77,7 +77,7 @@ GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION promise_detail::Map<Promise, Fn> Map(
 // and a bool indicating whether there was ever a Pending{} value observed from
 // polling.
 template <typename Promise>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION auto CheckDelayed(Promise promise) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline auto CheckDelayed(Promise promise) {
   using P = promise_detail::PromiseLike<Promise>;
   return [delayed = false, promise = P(std::move(promise))]() mutable
          -> Poll<std::tuple<typename P::Result, bool>> {

src/core/lib/promise/poll.h

@@ -223,8 +223,8 @@ struct PollTraits<Poll<T>> {
 };
 
 template <typename T>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION bool operator==(const Poll<T>& a,
-                                                     const Poll<T>& b) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline bool operator==(const Poll<T>& a,
+                                                            const Poll<T>& b) {
   if (a.pending() && b.pending()) return true;
   if (a.ready() && b.ready()) return a.value() == b.value();
   return false;
@@ -263,7 +263,7 @@ struct PollCastImpl<T, Poll<T>> {
 };
 
 template <typename T, typename U>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION Poll<T> poll_cast(U poll) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline Poll<T> poll_cast(U poll) {
   return PollCastImpl<T, U>::Cast(std::move(poll));
 }
 

src/core/lib/promise/promise.h

@@ -72,8 +72,8 @@ class Immediate {
 
 // Return \a value immediately
 template <typename T>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION promise_detail::Immediate<T> Immediate(
-    T value) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline promise_detail::Immediate<T>
+Immediate(T value) {
   return promise_detail::Immediate<T>(std::move(value));
 }
 
@@ -90,7 +90,7 @@ struct ImmediateOkStatus {
 // should fail to compile. When modifying this code these should be uncommented
 // and their miscompilation verified.
 template <typename T, typename F>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION auto WithResult(F f) ->
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline auto WithResult(F f) ->
     typename std::enable_if<std::is_same<decltype(f()), Poll<T>>::value,
                             F>::type {
   return f;

src/core/lib/promise/race.h

@@ -74,8 +74,8 @@ class Race<Promise> {
 /// If two results are simultaneously available, bias towards the first result
 /// listed.
 template <typename... Promises>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION promise_detail::Race<Promises...> Race(
-    Promises... promises) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline promise_detail::Race<Promises...>
+Race(Promises... promises) {
   return promise_detail::Race<Promises...>(std::move(promises)...);
 }
 

src/core/lib/promise/seq.h

@@ -107,32 +107,33 @@ struct SeqIterResultTraits {
 // etc
 // Return the final value.
 template <typename F>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION F Seq(F functor) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline F Seq(F functor) {
   return functor;
 }
 
 template <typename F0, typename F1>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION promise_detail::Seq<F0, F1> Seq(
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline promise_detail::Seq<F0, F1> Seq(
     F0 f0, F1 f1, DebugLocation whence = {}) {
   return promise_detail::Seq<F0, F1>(std::move(f0), std::move(f1), whence);
 }
 
 template <typename F0, typename F1, typename F2>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION promise_detail::Seq<F0, F1, F2> Seq(
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline promise_detail::Seq<F0, F1, F2> Seq(
     F0 f0, F1 f1, F2 f2, DebugLocation whence = {}) {
   return promise_detail::Seq<F0, F1, F2>(std::move(f0), std::move(f1),
                                          std::move(f2), whence);
 }
 
 template <typename F0, typename F1, typename F2, typename F3>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION promise_detail::Seq<F0, F1, F2, F3> Seq(
-    F0 f0, F1 f1, F2 f2, F3 f3, DebugLocation whence = {}) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline promise_detail::Seq<F0, F1, F2, F3>
+Seq(F0 f0, F1 f1, F2 f2, F3 f3, DebugLocation whence = {}) {
   return promise_detail::Seq<F0, F1, F2, F3>(
       std::move(f0), std::move(f1), std::move(f2), std::move(f3), whence);
 }
 
 template <typename F0, typename F1, typename F2, typename F3, typename F4>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION promise_detail::Seq<F0, F1, F2, F3, F4>
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline promise_detail::Seq<F0, F1, F2, F3,
+                                                                F4>
 Seq(F0 f0, F1 f1, F2 f2, F3 f3, F4 f4, DebugLocation whence = {}) {
   return promise_detail::Seq<F0, F1, F2, F3, F4>(std::move(f0), std::move(f1),
                                                  std::move(f2), std::move(f3),
@@ -141,7 +142,8 @@ Seq(F0 f0, F1 f1, F2 f2, F3 f3, F4 f4, DebugLocation whence = {}) {
 
 template <typename F0, typename F1, typename F2, typename F3, typename F4,
           typename F5>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION promise_detail::Seq<F0, F1, F2, F3, F4, F5>
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline promise_detail::Seq<F0, F1, F2, F3,
+                                                                F4, F5>
 Seq(F0 f0, F1 f1, F2 f2, F3 f3, F4 f4, F5 f5, DebugLocation whence = {}) {
   return promise_detail::Seq<F0, F1, F2, F3, F4, F5>(
       std::move(f0), std::move(f1), std::move(f2), std::move(f3), std::move(f4),

src/core/lib/promise/try_join.h

@@ -134,13 +134,14 @@ struct WrapInStatusOrTuple {
 // If any fail, cancel the rest and return the failure.
 // If all succeed, return Ok(tuple-of-results).
 template <template <typename> class R, typename... Promises>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION promise_detail::TryJoin<R, Promises...>
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline promise_detail::TryJoin<R,
+                                                                    Promises...>
 TryJoin(Promises... promises) {
   return promise_detail::TryJoin<R, Promises...>(std::move(promises)...);
 }
 
 template <template <typename> class R, typename F>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION auto TryJoin(F promise) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline auto TryJoin(F promise) {
   return Map(promise, promise_detail::WrapInStatusOrTuple<R>{});
 }
 

src/core/lib/promise/try_seq.h

@@ -278,32 +278,34 @@ struct TrySeqIterResultTraits {
 // Status to indicate only success/failure. In the case of returning Status,
 // the construction functors take no arguments.
 template <typename F>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION F TrySeq(F functor) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline F TrySeq(F functor) {
   return functor;
 }
 
 template <typename F0, typename F1>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION promise_detail::TrySeq<F0, F1> TrySeq(
-    F0 f0, F1 f1, DebugLocation whence = {}) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline promise_detail::TrySeq<F0, F1>
+TrySeq(F0 f0, F1 f1, DebugLocation whence = {}) {
   return promise_detail::TrySeq<F0, F1>(std::move(f0), std::move(f1), whence);
 }
 
 template <typename F0, typename F1, typename F2>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION promise_detail::TrySeq<F0, F1, F2> TrySeq(
-    F0 f0, F1 f1, F2 f2, DebugLocation whence = {}) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline promise_detail::TrySeq<F0, F1, F2>
+TrySeq(F0 f0, F1 f1, F2 f2, DebugLocation whence = {}) {
   return promise_detail::TrySeq<F0, F1, F2>(std::move(f0), std::move(f1),
                                             std::move(f2), whence);
 }
 
 template <typename F0, typename F1, typename F2, typename F3>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION promise_detail::TrySeq<F0, F1, F2, F3>
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline promise_detail::TrySeq<F0, F1, F2,
+                                                                   F3>
 TrySeq(F0 f0, F1 f1, F2 f2, F3 f3, DebugLocation whence = {}) {
   return promise_detail::TrySeq<F0, F1, F2, F3>(
       std::move(f0), std::move(f1), std::move(f2), std::move(f3), whence);
 }
 
 template <typename F0, typename F1, typename F2, typename F3, typename F4>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION promise_detail::TrySeq<F0, F1, F2, F3, F4>
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline promise_detail::TrySeq<F0, F1, F2,
+                                                                   F3, F4>
 TrySeq(F0 f0, F1 f1, F2 f2, F3 f3, F4 f4, DebugLocation whence = {}) {
   return promise_detail::TrySeq<F0, F1, F2, F3, F4>(
       std::move(f0), std::move(f1), std::move(f2), std::move(f3), std::move(f4),

src/core/lib/resource_quota/arena.h

@@ -94,7 +94,7 @@ class ArenaContextTraits : public BaseArenaContextTraits {
 };
 
 template <typename T>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION void DestroyArenaContext(void* p) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline void DestroyArenaContext(void* p) {
   ArenaContextType<T>::Destroy(static_cast<T*>(p));
 }
 

src/core/util/construct_destruct.h

@@ -24,14 +24,15 @@ namespace grpc_core {
 
 // Call the destructor of p without having to name the type of p.
 template <typename T>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION void Destruct(T* p) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline void Destruct(T* p) {
   p->~T();
 }
 
 // Call the constructor of p without having to name the type of p and forward
 // any arguments
 template <typename T, typename... Args>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION void Construct(T* p, Args&&... args) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline void Construct(T* p,
+                                                           Args&&... args) {
   new (p) T(std::forward<Args>(args)...);
 }
 

src/core/util/down_cast.h

@@ -25,7 +25,7 @@
 namespace grpc_core {
 
 template <typename To, typename From>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION To DownCast(From* f) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline To DownCast(From* f) {
   static_assert(
       std::is_base_of<From, typename std::remove_pointer<To>::type>::value,
       "DownCast requires a base-to-derived relationship");
@@ -39,7 +39,7 @@ GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION To DownCast(From* f) {
 }
 
 template <typename To, typename From>
-GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION To DownCast(From& f) {
+GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION inline To DownCast(From& f) {
   return *DownCast<typename std::remove_reference<To>::type*>(&f);
 }