[compiler-rt] [sanitizer_common] Use HW_NCPUONLINE sysctl on NetBSD in GetNumberOfC… (PR #134704)

[Brad Smith via llvm-commits]

https://github.com/brad0 updated https://github.com/llvm/llvm-project/pull/134704

>From 2dfb095babfc35d525a054602cda2aca839a51dd Mon Sep 17 00:00:00 2001
From: Brad Smith <brad at comstyle.com>
Date: Mon, 7 Apr 2025 14:46:20 -0400
Subject: [PATCH] [sanitizer_common] Use HW_NCPUONLINE sysctl on NetBSD in
 GetNumberOfCPUs()

---
 compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp
index e5e79d4e0521c..ffd240974454e 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp
@@ -840,7 +840,11 @@ u32 GetNumberOfCPUs() {
   int req[2];
   uptr len = sizeof(ncpu);
   req[0] = CTL_HW;
+#    ifdef HW_NCPUONLINE
+  req[1] = HW_NCPUONLINE;
+#    else
   req[1] = HW_NCPU;
+#    endif
   CHECK_EQ(internal_sysctl(req, 2, &ncpu, &len, NULL, 0), 0);
   return ncpu;
 #  elif SANITIZER_SOLARIS