From b9f6ef50af59b51584acd9a05690d53943dbf52e Mon Sep 17 00:00:00 2001
From: Eric Liu <eric@ericxliu.me>
Date: Sat, 1 Feb 2025 06:52:15 +0000
Subject: [PATCH] Add fallback for cache line size detection

- Provide default cache line size for systems without _SC_LEVEL1_DCACHE_LINESIZE
- Set default to 64 bytes, which is common on x86_64 architectures
- Improve portability of cache line size detection
---
 malign_buffer.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/malign_buffer.cc b/malign_buffer.cc
index 5845ffb..f343c4e 100644
--- a/malign_buffer.cc
+++ b/malign_buffer.cc
@@ -127,7 +127,12 @@ void MalignBuffer::InitializeMemoryForSanitizer(char *addr, size_t size) {
 }
 
 const size_t MalignBuffer::kPageSize = sysconf(_SC_PAGESIZE);
+#ifdef _SC_LEVEL1_DCACHE_LINESIZE
 const size_t MalignBuffer::kCacheLineSize = sysconf(_SC_LEVEL1_DCACHE_LINESIZE);
+#else
+// Default to 64 bytes which is common on x86_64
+const size_t MalignBuffer::kCacheLineSize = 64;
+#endif
 
 std::string MalignBuffer::ToString(CopyMethod m) {
   switch (m) {