From 2058c67fec67918434561dec1a928aee7f07f12d Mon Sep 17 00:00:00 2001
From: win32ss <win32ss@nulln.nl>
Date: Fri, 8 Mar 2024 15:31:45 -0500
Subject: [PATCH] Efficency core information blocked before Windows 10.

---
 base/system/sys_info_win.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/base/system/sys_info_win.cc b/base/system/sys_info_win.cc
index 68626967de317..0c68025ebf605 100644
--- a/base/system/sys_info_win.cc
+++ b/base/system/sys_info_win.cc
@@ -153,6 +153,9 @@ int SysInfo::NumberOfProcessors() {
 
 // static
 int SysInfo::NumberOfEfficientProcessorsImpl() {
+  // No efficiency support before Windows 10.
+  if (win::GetVersion() < win::Version::WIN10)
+	  return 0;
   std::vector<BYTE> efficiency_classes = GetCoreEfficiencyClasses();
   if (efficiency_classes.empty())
     return 0;