Kernel: Store whether a thread is the idle thread in Thread directly

This solves a problem where checking whether a thread is an idle
thread may require iterating all processors if it is not the idle
thread of the current processor.

1 files changed, 6 insertions, 5 deletions

diff --git a/Kernel/Arch/x86/CPU.h b/Kernel/Arch/x86/CPU.h
index 64f6114e58..296ea2e39a 100644
--- a/Kernel/Arch/x86/CPU.h
+++ b/Kernel/Arch/x86/CPU.h
@@ -779,11 +779,6 @@ public:
         return *m_mm_data;
     }
 
-    ALWAYS_INLINE Thread* idle_thread() const
-    {
-        return m_idle_thread;
-    }
-
     ALWAYS_INLINE void set_idle_thread(Thread& idle_thread)
     {
         m_idle_thread = &idle_thread;
@@ -806,6 +801,12 @@ public:
         write_fs_u32(__builtin_offsetof(Processor, m_current_thread), FlatPtr(&current_thread));
     }
 
+    ALWAYS_INLINE static Thread* idle_thread()
+    {
+        // See comment in Processor::current_thread
+        return (Thread*)read_fs_u32(__builtin_offsetof(Processor, m_idle_thread));
+    }
+
     ALWAYS_INLINE u32 get_id() const
     {
         // NOTE: This variant should only be used when iterating over all