diff --git a/src/core/cheats/cheats.cpp b/src/core/cheats/cheats.cpp
index 440047ffe..9d9e94121 100644
--- a/src/core/cheats/cheats.cpp
+++ b/src/core/cheats/cheats.cpp
@@ -102,7 +102,7 @@ void CheatEngine::LoadCheatFile() {
     }
 }
 
-void CheatEngine::RunCallback([[maybe_unused]] u64 userdata, s64 cycles_late) {
+void CheatEngine::RunCallback([[maybe_unused]] std::uintptr_t user_data, s64 cycles_late) {
     {
         std::shared_lock<std::shared_mutex> lock(cheats_list_mutex);
         for (auto& cheat : cheats_list) {
diff --git a/src/core/cheats/cheats.h b/src/core/cheats/cheats.h
index c45c1044f..813263236 100644
--- a/src/core/cheats/cheats.h
+++ b/src/core/cheats/cheats.h
@@ -35,7 +35,7 @@ public:
 
 private:
     void LoadCheatFile();
-    void RunCallback(u64 userdata, s64 cycles_late);
+    void RunCallback(std::uintptr_t user_data, s64 cycles_late);
     std::vector<std::shared_ptr<CheatBase>> cheats_list;
     mutable std::shared_mutex cheats_list_mutex;
     Core::TimingEventType* event;
diff --git a/src/core/core_timing.cpp b/src/core/core_timing.cpp
index bf9adebf5..a865bd4aa 100644
--- a/src/core/core_timing.cpp
+++ b/src/core/core_timing.cpp
@@ -47,8 +47,8 @@ TimingEventType* Timing::RegisterEvent(const std::string& name, TimedCallback ca
     return event_type;
 }
 
-void Timing::ScheduleEvent(s64 cycles_into_future, const TimingEventType* event_type, u64 userdata,
-                           std::size_t core_id) {
+void Timing::ScheduleEvent(s64 cycles_into_future, const TimingEventType* event_type,
+                           std::uintptr_t user_data, std::size_t core_id) {
     if (event_queue_locked) {
         return;
     }
@@ -69,22 +69,22 @@ void Timing::ScheduleEvent(s64 cycles_into_future, const TimingEventType* event_
             timer->ForceExceptionCheck(cycles_into_future);
 
         timer->event_queue.emplace_back(
-            Event{timeout, timer->event_fifo_id++, userdata, event_type});
+            Event{timeout, timer->event_fifo_id++, user_data, event_type});
         std::push_heap(timer->event_queue.begin(), timer->event_queue.end(), std::greater<>());
     } else {
         timer->ts_queue.Push(Event{static_cast<s64>(timer->GetTicks() + cycles_into_future), 0,
-                                   userdata, event_type});
+                                   user_data, event_type});
     }
 }
 
-void Timing::UnscheduleEvent(const TimingEventType* event_type, u64 userdata) {
+void Timing::UnscheduleEvent(const TimingEventType* event_type, std::uintptr_t user_data) {
     if (event_queue_locked) {
         return;
     }
     for (auto timer : timers) {
         auto itr = std::remove_if(
             timer->event_queue.begin(), timer->event_queue.end(),
-            [&](const Event& e) { return e.type == event_type && e.userdata == userdata; });
+            [&](const Event& e) { return e.type == event_type && e.user_data == user_data; });
 
         // Removing random items breaks the invariant so we have to re-establish it.
         if (itr != timer->event_queue.end()) {
@@ -215,7 +215,7 @@ void Timing::Timer::Advance() {
         std::pop_heap(event_queue.begin(), event_queue.end(), std::greater<>());
         event_queue.pop_back();
         if (evt.type->callback != nullptr) {
-            evt.type->callback(evt.userdata, static_cast<int>(executed_ticks - evt.time));
+            evt.type->callback(evt.user_data, static_cast<int>(executed_ticks - evt.time));
         } else {
             LOG_ERROR(Core, "Event '{}' has no callback", *evt.type->name);
         }
diff --git a/src/core/core_timing.h b/src/core/core_timing.h
index 11ef4d35b..3fe99bf67 100644
--- a/src/core/core_timing.h
+++ b/src/core/core_timing.h
@@ -128,7 +128,7 @@ constexpr u64 cyclesToMs(s64 cycles) {
 
 namespace Core {
 
-using TimedCallback = std::function<void(u64 userdata, int cycles_late)>;
+using TimedCallback = std::function<void(std::uintptr_t user_data, int cycles_late)>;
 
 struct TimingEventType {
     TimedCallback callback;
@@ -141,7 +141,7 @@ public:
     struct Event {
         s64 time;
         u64 fifo_order;
-        u64 userdata;
+        std::uintptr_t user_data;
         const TimingEventType* type;
 
         bool operator>(const Event& right) const;
@@ -152,7 +152,7 @@ public:
         void save(Archive& ar, const unsigned int) const {
             ar& time;
             ar& fifo_order;
-            ar& userdata;
+            ar& user_data;
             std::string name = *(type->name);
             ar << name;
         }
@@ -161,7 +161,7 @@ public:
         void load(Archive& ar, const unsigned int) {
             ar& time;
             ar& fifo_order;
-            ar& userdata;
+            ar& user_data;
             std::string name;
             ar >> name;
             type = Global<Timing>().RegisterEvent(name, nullptr);
@@ -265,10 +265,11 @@ public:
      */
     TimingEventType* RegisterEvent(const std::string& name, TimedCallback callback);
 
-    void ScheduleEvent(s64 cycles_into_future, const TimingEventType* event_type, u64 userdata = 0,
+    void ScheduleEvent(s64 cycles_into_future, const TimingEventType* event_type,
+                       std::uintptr_t user_data = 0,
                        std::size_t core_id = std::numeric_limits<std::size_t>::max());
 
-    void UnscheduleEvent(const TimingEventType* event_type, u64 userdata);
+    void UnscheduleEvent(const TimingEventType* event_type, std::uintptr_t user_data);
 
     /// We only permit one event of each type in the queue at a time.
     void RemoveEvent(const TimingEventType* event_type);
diff --git a/src/core/hle/kernel/shared_page.cpp b/src/core/hle/kernel/shared_page.cpp
index 87189e26e..443ee930d 100644
--- a/src/core/hle/kernel/shared_page.cpp
+++ b/src/core/hle/kernel/shared_page.cpp
@@ -108,7 +108,7 @@ u64 Handler::GetSystemTime() const {
     return console_time;
 }
 
-void Handler::UpdateTimeCallback(u64 userdata, int cycles_late) {
+void Handler::UpdateTimeCallback(std::uintptr_t user_data, int cycles_late) {
     DateTime& date_time =
         shared_page.date_time_counter % 2 ? shared_page.date_time_0 : shared_page.date_time_1;
 
diff --git a/src/core/hle/kernel/shared_page.h b/src/core/hle/kernel/shared_page.h
index 9cd579d52..531cb2a28 100644
--- a/src/core/hle/kernel/shared_page.h
+++ b/src/core/hle/kernel/shared_page.h
@@ -114,7 +114,7 @@ public:
 
 private:
     u64 GetSystemTime() const;
-    void UpdateTimeCallback(u64 userdata, int cycles_late);
+    void UpdateTimeCallback(std::uintptr_t user_data, int cycles_late);
     Core::Timing& timing;
     Core::TimingEventType* update_time_event;
     std::chrono::seconds init_time;
diff --git a/src/core/hle/service/cam/cam.cpp b/src/core/hle/service/cam/cam.cpp
index 77be92a53..abd3a7ee5 100644
--- a/src/core/hle/service/cam/cam.cpp
+++ b/src/core/hle/service/cam/cam.cpp
@@ -1118,11 +1118,12 @@ Module::Module(Core::System& system) : system(system) {
             system.Kernel().CreateEvent(ResetType::OneShot, "CAM::vsync_interrupt_event");
     }
     completion_event_callback = system.CoreTiming().RegisterEvent(
-        "CAM::CompletionEventCallBack",
-        [this](u64 userdata, s64 cycles_late) { CompletionEventCallBack(userdata, cycles_late); });
+        "CAM::CompletionEventCallBack", [this](std::uintptr_t user_data, s64 cycles_late) {
+            CompletionEventCallBack(user_data, cycles_late);
+        });
     vsync_interrupt_event_callback = system.CoreTiming().RegisterEvent(
-        "CAM::VsyncInterruptEventCallBack", [this](u64 userdata, s64 cycles_late) {
-            VsyncInterruptEventCallBack(userdata, cycles_late);
+        "CAM::VsyncInterruptEventCallBack", [this](std::uintptr_t user_data, s64 cycles_late) {
+            VsyncInterruptEventCallBack(user_data, cycles_late);
         });
 }
 
diff --git a/src/core/hle/service/hid/hid.cpp b/src/core/hle/service/hid/hid.cpp
index c59826551..aba6c8291 100644
--- a/src/core/hle/service/hid/hid.cpp
+++ b/src/core/hle/service/hid/hid.cpp
@@ -105,7 +105,7 @@ void Module::LoadInputDevices() {
     }
 }
 
-void Module::UpdatePadCallback(u64 userdata, s64 cycles_late) {
+void Module::UpdatePadCallback(std::uintptr_t user_data, s64 cycles_late) {
     SharedMem* mem = reinterpret_cast<SharedMem*>(shared_mem->GetPointer());
 
     if (is_device_reload_pending.exchange(false))
@@ -225,7 +225,7 @@ void Module::UpdatePadCallback(u64 userdata, s64 cycles_late) {
     system.CoreTiming().ScheduleEvent(pad_update_ticks - cycles_late, pad_update_event);
 }
 
-void Module::UpdateAccelerometerCallback(u64 userdata, s64 cycles_late) {
+void Module::UpdateAccelerometerCallback(std::uintptr_t user_data, s64 cycles_late) {
     SharedMem* mem = reinterpret_cast<SharedMem*>(shared_mem->GetPointer());
 
     mem->accelerometer.index = next_accelerometer_index;
@@ -270,7 +270,7 @@ void Module::UpdateAccelerometerCallback(u64 userdata, s64 cycles_late) {
                                       accelerometer_update_event);
 }
 
-void Module::UpdateGyroscopeCallback(u64 userdata, s64 cycles_late) {
+void Module::UpdateGyroscopeCallback(std::uintptr_t user_data, s64 cycles_late) {
     SharedMem* mem = reinterpret_cast<SharedMem*>(shared_mem->GetPointer());
 
     mem->gyroscope.index = next_gyroscope_index;
@@ -438,17 +438,17 @@ Module::Module(Core::System& system) : system(system) {
 
     // Register update callbacks
     Core::Timing& timing = system.CoreTiming();
-    pad_update_event =
-        timing.RegisterEvent("HID::UpdatePadCallback", [this](u64 userdata, s64 cycles_late) {
-            UpdatePadCallback(userdata, cycles_late);
-        });
+    pad_update_event = timing.RegisterEvent("HID::UpdatePadCallback",
+                                            [this](std::uintptr_t user_data, s64 cycles_late) {
+                                                UpdatePadCallback(user_data, cycles_late);
+                                            });
     accelerometer_update_event = timing.RegisterEvent(
-        "HID::UpdateAccelerometerCallback", [this](u64 userdata, s64 cycles_late) {
-            UpdateAccelerometerCallback(userdata, cycles_late);
+        "HID::UpdateAccelerometerCallback", [this](std::uintptr_t user_data, s64 cycles_late) {
+            UpdateAccelerometerCallback(user_data, cycles_late);
         });
-    gyroscope_update_event =
-        timing.RegisterEvent("HID::UpdateGyroscopeCallback", [this](u64 userdata, s64 cycles_late) {
-            UpdateGyroscopeCallback(userdata, cycles_late);
+    gyroscope_update_event = timing.RegisterEvent(
+        "HID::UpdateGyroscopeCallback", [this](std::uintptr_t user_data, s64 cycles_late) {
+            UpdateGyroscopeCallback(user_data, cycles_late);
         });
 
     timing.ScheduleEvent(pad_update_ticks, pad_update_event);
diff --git a/src/core/hle/service/hid/hid.h b/src/core/hle/service/hid/hid.h
index b364c4be8..c0f74ced1 100644
--- a/src/core/hle/service/hid/hid.h
+++ b/src/core/hle/service/hid/hid.h
@@ -307,9 +307,9 @@ public:
 
 private:
     void LoadInputDevices();
-    void UpdatePadCallback(u64 userdata, s64 cycles_late);
-    void UpdateAccelerometerCallback(u64 userdata, s64 cycles_late);
-    void UpdateGyroscopeCallback(u64 userdata, s64 cycles_late);
+    void UpdatePadCallback(std::uintptr_t user_data, s64 cycles_late);
+    void UpdateAccelerometerCallback(std::uintptr_t user_data, s64 cycles_late);
+    void UpdateGyroscopeCallback(std::uintptr_t user_data, s64 cycles_late);
 
     Core::System& system;
 
diff --git a/src/core/hle/service/ir/ir_rst.cpp b/src/core/hle/service/ir/ir_rst.cpp
index bd6c64af3..7372bec5e 100644
--- a/src/core/hle/service/ir/ir_rst.cpp
+++ b/src/core/hle/service/ir/ir_rst.cpp
@@ -66,7 +66,7 @@ void IR_RST::UnloadInputDevices() {
     c_stick = nullptr;
 }
 
-void IR_RST::UpdateCallback(u64 userdata, s64 cycles_late) {
+void IR_RST::UpdateCallback(std::uintptr_t user_data, s64 cycles_late) {
     SharedMem* mem = reinterpret_cast<SharedMem*>(shared_memory->GetPointer());
 
     if (is_device_reload_pending.exchange(false))
@@ -175,8 +175,9 @@ IR_RST::IR_RST(Core::System& system) : ServiceFramework("ir:rst", 1), system(sys
     update_event = system.Kernel().CreateEvent(ResetType::OneShot, "IRRST:UpdateEvent");
 
     update_callback_id = system.CoreTiming().RegisterEvent(
-        "IRRST:UpdateCallBack",
-        [this](u64 userdata, s64 cycles_late) { UpdateCallback(userdata, cycles_late); });
+        "IRRST:UpdateCallBack", [this](std::uintptr_t user_data, s64 cycles_late) {
+            UpdateCallback(user_data, cycles_late);
+        });
 
     static const FunctionInfo functions[] = {
         {0x00010000, &IR_RST::GetHandles, "GetHandles"},
diff --git a/src/core/hle/service/ir/ir_rst.h b/src/core/hle/service/ir/ir_rst.h
index 8e17381ad..2514ab6f9 100644
--- a/src/core/hle/service/ir/ir_rst.h
+++ b/src/core/hle/service/ir/ir_rst.h
@@ -74,7 +74,7 @@ private:
 
     void LoadInputDevices();
     void UnloadInputDevices();
-    void UpdateCallback(u64 userdata, s64 cycles_late);
+    void UpdateCallback(std::uintptr_t user_data, s64 cycles_late);
 
     Core::System& system;
     std::shared_ptr<Kernel::Event> update_event;
diff --git a/src/core/hle/service/mic_u.cpp b/src/core/hle/service/mic_u.cpp
index a09ef14ef..d95bcc890 100644
--- a/src/core/hle/service/mic_u.cpp
+++ b/src/core/hle/service/mic_u.cpp
@@ -126,9 +126,9 @@ struct MIC_U::Impl {
     explicit Impl(Core::System& system) : timing(system.CoreTiming()) {
         buffer_full_event =
             system.Kernel().CreateEvent(Kernel::ResetType::OneShot, "MIC_U::buffer_full_event");
-        buffer_write_event =
-            timing.RegisterEvent("MIC_U::UpdateBuffer", [this](u64 userdata, s64 cycles_late) {
-                UpdateSharedMemBuffer(userdata, cycles_late);
+        buffer_write_event = timing.RegisterEvent(
+            "MIC_U::UpdateBuffer", [this](std::uintptr_t user_data, s64 cycles_late) {
+                UpdateSharedMemBuffer(user_data, cycles_late);
             });
     }
 
@@ -158,7 +158,7 @@ struct MIC_U::Impl {
         LOG_TRACE(Service_MIC, "called");
     }
 
-    void UpdateSharedMemBuffer(u64 userdata, s64 cycles_late) {
+    void UpdateSharedMemBuffer(std::uintptr_t user_data, s64 cycles_late) {
         if (change_mic_impl_requested.exchange(false)) {
             CreateMic();
         }
diff --git a/src/core/hle/service/nwm/nwm_uds.cpp b/src/core/hle/service/nwm/nwm_uds.cpp
index 988fbcc4f..579ee159c 100644
--- a/src/core/hle/service/nwm/nwm_uds.cpp
+++ b/src/core/hle/service/nwm/nwm_uds.cpp
@@ -1443,7 +1443,7 @@ void NWM_UDS::DecryptBeaconData(Kernel::HLERequestContext& ctx) {
 }
 
 // Sends a 802.11 beacon frame with information about the current network.
-void NWM_UDS::BeaconBroadcastCallback(u64 userdata, s64 cycles_late) {
+void NWM_UDS::BeaconBroadcastCallback(std::uintptr_t user_data, s64 cycles_late) {
     // Don't do anything if we're not actually hosting a network
     if (connection_status.status != static_cast<u32>(NetworkStatus::ConnectedAsHost))
         return;
@@ -1503,8 +1503,9 @@ NWM_UDS::NWM_UDS(Core::System& system) : ServiceFramework("nwm::UDS"), system(sy
     RegisterHandlers(functions);
 
     beacon_broadcast_event = system.CoreTiming().RegisterEvent(
-        "UDS::BeaconBroadcastCallback",
-        [this](u64 userdata, s64 cycles_late) { BeaconBroadcastCallback(userdata, cycles_late); });
+        "UDS::BeaconBroadcastCallback", [this](std::uintptr_t user_data, s64 cycles_late) {
+            BeaconBroadcastCallback(user_data, cycles_late);
+        });
 
     CryptoPP::AutoSeededRandomPool rng;
     auto mac = SharedPage::DefaultMac;
diff --git a/src/core/hle/service/nwm/nwm_uds.h b/src/core/hle/service/nwm/nwm_uds.h
index c5bff31ac..e8eeb360a 100644
--- a/src/core/hle/service/nwm/nwm_uds.h
+++ b/src/core/hle/service/nwm/nwm_uds.h
@@ -459,7 +459,7 @@ private:
                           const u8* network_info_buffer, std::size_t network_info_size,
                           u8 connection_type, std::vector<u8> passphrase);
 
-    void BeaconBroadcastCallback(u64 userdata, s64 cycles_late);
+    void BeaconBroadcastCallback(std::uintptr_t user_data, s64 cycles_late);
 
     /**
      * Returns a list of received 802.11 beacon frames from the specified sender since the last
diff --git a/src/core/hw/gpu.cpp b/src/core/hw/gpu.cpp
index 39b87155f..983644282 100644
--- a/src/core/hw/gpu.cpp
+++ b/src/core/hw/gpu.cpp
@@ -503,7 +503,7 @@ template void Write<u16>(u32 addr, const u16 data);
 template void Write<u8>(u32 addr, const u8 data);
 
 /// Update hardware
-static void VBlankCallback(u64 userdata, s64 cycles_late) {
+static void VBlankCallback(std::uintptr_t user_data, s64 cycles_late) {
     VideoCore::g_renderer->SwapBuffers();
 
     // Signal to GSP that GPU interrupt has occurred
diff --git a/src/tests/core/core_timing.cpp b/src/tests/core/core_timing.cpp
index e82ffc8a3..970d43eb1 100644
--- a/src/tests/core/core_timing.cpp
+++ b/src/tests/core/core_timing.cpp
@@ -21,10 +21,10 @@ static u64 expected_callback = 0;
 static s64 lateness = 0;
 
 template <unsigned int IDX>
-void CallbackTemplate(u64 userdata, s64 cycles_late) {
+void CallbackTemplate(std::uintptr_t user_data, s64 cycles_late) {
     static_assert(IDX < CB_IDS.size(), "IDX out of range");
     callbacks_ran_flags.set(IDX);
-    REQUIRE(CB_IDS[IDX] == userdata);
+    REQUIRE(CB_IDS[IDX] == user_data);
     REQUIRE(CB_IDS[IDX] == expected_callback);
     REQUIRE(lateness == cycles_late);
 }
@@ -81,10 +81,10 @@ namespace SharedSlotTest {
 static unsigned int counter = 0;
 
 template <unsigned int ID>
-void FifoCallback(u64 userdata, s64 cycles_late) {
+void FifoCallback(std::uintptr_t user_data, s64 cycles_late) {
     static_assert(ID < CB_IDS.size(), "ID out of range");
     callbacks_ran_flags.set(ID);
-    REQUIRE(CB_IDS[ID] == userdata);
+    REQUIRE(CB_IDS[ID] == user_data);
     REQUIRE(ID == counter);
     REQUIRE(lateness == cycles_late);
     ++counter;
@@ -143,13 +143,13 @@ TEST_CASE("CoreTiming[PredictableLateness]", "[core]") {
 namespace ChainSchedulingTest {
 static int reschedules = 0;
 
-static void RescheduleCallback(Core::Timing& timing, u64 userdata, s64 cycles_late) {
+static void RescheduleCallback(Core::Timing& timing, std::uintptr_t user_data, s64 cycles_late) {
     --reschedules;
     REQUIRE(reschedules >= 0);
     REQUIRE(lateness == cycles_late);
 
     if (reschedules > 0)
-        timing.ScheduleEvent(1000, reinterpret_cast<Core::TimingEventType*>(userdata), userdata);
+        timing.ScheduleEvent(1000, reinterpret_cast<Core::TimingEventType*>(user_data), user_data);
 }
 } // namespace ChainSchedulingTest
 
@@ -161,9 +161,9 @@ TEST_CASE("CoreTiming[ChainScheduling]", "[core]") {
     Core::TimingEventType* cb_a = timing.RegisterEvent("callbackA", CallbackTemplate<0>);
     Core::TimingEventType* cb_b = timing.RegisterEvent("callbackB", CallbackTemplate<1>);
     Core::TimingEventType* cb_c = timing.RegisterEvent("callbackC", CallbackTemplate<2>);
-    Core::TimingEventType* cb_rs =
-        timing.RegisterEvent("callbackReschedule", [&timing](u64 userdata, s64 cycles_late) {
-            RescheduleCallback(timing, userdata, cycles_late);
+    Core::TimingEventType* cb_rs = timing.RegisterEvent(
+        "callbackReschedule", [&timing](std::uintptr_t user_data, s64 cycles_late) {
+            RescheduleCallback(timing, user_data, cycles_late);
         });
 
     // Enter slice 0