Kernel: Replace KResult and KResultOr<T> with Error and ErrorOr<T>

We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace!
This was a slightly tedious refactoring that took a long time, so it's
not unlikely that some bugs crept in.

Nevertheless, it does pass basic functionality testing, and it's just
real nice to finally see the same pattern in all contexts. :^)

1 files changed, 8 insertions, 8 deletions

diff --git a/Kernel/PerformanceEventBuffer.cpp b/Kernel/PerformanceEventBuffer.cpp
index 5aeca08000..fc8e10f3da 100644
--- a/Kernel/PerformanceEventBuffer.cpp
+++ b/Kernel/PerformanceEventBuffer.cpp
@@ -21,7 +21,7 @@ PerformanceEventBuffer::PerformanceEventBuffer(NonnullOwnPtr<KBuffer> buffer)
 {
 }
 
-NEVER_INLINE KResult PerformanceEventBuffer::append(int type, FlatPtr arg1, FlatPtr arg2, const StringView& arg3, Thread* current_thread)
+NEVER_INLINE ErrorOr<void> PerformanceEventBuffer::append(int type, FlatPtr arg1, FlatPtr arg2, const StringView& arg3, Thread* current_thread)
 {
     FlatPtr ebp;
     asm volatile("movl %%ebp, %%eax"
@@ -55,13 +55,13 @@ static Vector<FlatPtr, PerformanceEvent::max_stack_frame_count> raw_backtrace(Fl
     return backtrace;
 }
 
-KResult PerformanceEventBuffer::append_with_ip_and_bp(ProcessID pid, ThreadID tid, const RegisterState& regs,
+ErrorOr<void> PerformanceEventBuffer::append_with_ip_and_bp(ProcessID pid, ThreadID tid, const RegisterState& regs,
     int type, u32 lost_samples, FlatPtr arg1, FlatPtr arg2, const StringView& arg3)
 {
     return append_with_ip_and_bp(pid, tid, regs.ip(), regs.bp(), type, lost_samples, arg1, arg2, arg3);
 }
 
-KResult PerformanceEventBuffer::append_with_ip_and_bp(ProcessID pid, ThreadID tid,
+ErrorOr<void> PerformanceEventBuffer::append_with_ip_and_bp(ProcessID pid, ThreadID tid,
     FlatPtr ip, FlatPtr bp, int type, u32 lost_samples, FlatPtr arg1, FlatPtr arg2, const StringView& arg3)
 {
     if (count() >= capacity())
@@ -160,7 +160,7 @@ KResult PerformanceEventBuffer::append_with_ip_and_bp(ProcessID pid, ThreadID ti
     event.tid = tid.value();
     event.timestamp = TimeManagement::the().uptime_ms();
     at(m_count++) = event;
-    return KSuccess;
+    return {};
 }
 
 PerformanceEvent& PerformanceEventBuffer::at(size_t index)
@@ -171,7 +171,7 @@ PerformanceEvent& PerformanceEventBuffer::at(size_t index)
 }
 
 template<typename Serializer>
-KResult PerformanceEventBuffer::to_json_impl(Serializer& object) const
+ErrorOr<void> PerformanceEventBuffer::to_json_impl(Serializer& object) const
 {
     {
         auto strings = object.add_array("strings");
@@ -270,10 +270,10 @@ KResult PerformanceEventBuffer::to_json_impl(Serializer& object) const
     }
     array.finish();
     object.finish();
-    return KSuccess;
+    return {};
 }
 
-KResult PerformanceEventBuffer::to_json(KBufferBuilder& builder) const
+ErrorOr<void> PerformanceEventBuffer::to_json(KBufferBuilder& builder) const
 {
     JsonObjectSerializer object(builder);
     return to_json_impl(object);
@@ -312,7 +312,7 @@ void PerformanceEventBuffer::add_process(const Process& process, ProcessEventTyp
     }
 }
 
-KResultOr<FlatPtr> PerformanceEventBuffer::register_string(NonnullOwnPtr<KString> string)
+ErrorOr<FlatPtr> PerformanceEventBuffer::register_string(NonnullOwnPtr<KString> string)
 {
     FlatPtr string_id = m_strings.size();