From 7276853b029a816e253da351694eeda09812de74 Mon Sep 17 00:00:00 2001
From: IndecisiveTurtle <geoster3d@gmail.com>
Date: Sun, 1 Dec 2024 16:19:50 +0200
Subject: [PATCH] page_manager: Enable userfaultfd by default

* Much faster than page faults and causes less problems
---
 CMakeLists.txt                  | 4 ++++
 src/video_core/page_manager.cpp | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 378b8f78d..ae6d1d74e 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -875,6 +875,10 @@ target_link_libraries(shadps4 PRIVATE Boost::headers GPUOpen::VulkanMemoryAlloca
 target_compile_definitions(shadps4 PRIVATE IMGUI_USER_CONFIG="imgui/imgui_config.h")
 target_compile_definitions(Dear_ImGui PRIVATE IMGUI_USER_CONFIG="${PROJECT_SOURCE_DIR}/src/imgui/imgui_config.h")
 
+if (${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
+    target_compile_definitions(shadps4 PRIVATE ENABLE_USERFAULTFD)
+endif()
+
 if (APPLE)
   option(USE_SYSTEM_VULKAN_LOADER "Enables using the system Vulkan loader instead of directly linking with MoltenVK. Useful for loading validation layers." OFF)
   if (USE_SYSTEM_VULKAN_LOADER)
diff --git a/src/video_core/page_manager.cpp b/src/video_core/page_manager.cpp
index d26a7067a..80b91b825 100644
--- a/src/video_core/page_manager.cpp
+++ b/src/video_core/page_manager.cpp
@@ -29,7 +29,7 @@ namespace VideoCore {
 constexpr size_t PAGESIZE = 4_KB;
 constexpr size_t PAGEBITS = 12;
 
-#if ENABLE_USERFAULTFD
+#ifdef ENABLE_USERFAULTFD
 struct PageManager::Impl {
     Impl(Vulkan::Rasterizer* rasterizer_) : rasterizer{rasterizer_} {
         uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);