Deal with very old linux kernels

MADV_HUGEPAGE might not be available, for kernels before 2.6.38 (released 2011). Just skip the madvise.

closes https://github.com/official-stockfish/Stockfish/pull/3039

No functional change

diff --git a/src/misc.cpp b/src/misc.cpp
index 459ea10035b6ae9e6a4de47e01a60f2dec596865..56a3dcad42d888fb7afeccc808f69432fbccf1c6 100644 (file)
--- a/src/misc.cpp
+++ b/src/misc.cpp
@@ -367,7 +367,9 @@ void* aligned_ttmem_alloc(size_t allocSize, void*& mem) {
   size_t size = ((allocSize + alignment - 1) / alignment) * alignment; // multiple of alignment
   if (posix_memalign(&mem, alignment, size))
      mem = nullptr;
   size_t size = ((allocSize + alignment - 1) / alignment) * alignment; // multiple of alignment
   if (posix_memalign(&mem, alignment, size))
      mem = nullptr;

+#if defined(MADV_HUGEPAGE)

   madvise(mem, allocSize, MADV_HUGEPAGE);
   madvise(mem, allocSize, MADV_HUGEPAGE);

+#endif

   return mem;
 }
 
   return mem;
 }