Fix linux build.

src/Mem_unix.cpp

@@ -22,5 +22,61 @@
  */
 
 
+#include <stdlib.h>
+#include <mm_malloc.h>
+#include <sys/mman.h>
+
+
 #include "crypto/CryptoNight.h"
 #include "Mem.h"
+#include "Options.h"
+#include "Console.h"
+
+
+bool Mem::allocate(int algo, int threads, bool doubleHash)
+{
+    m_algo       = algo;
+    m_threads    = threads;
+    m_doubleHash = doubleHash;
+
+    const int ratio   = (doubleHash && algo != Options::ALGO_CRYPTONIGHT_LITE) ? 2 : 1;
+    const size_t size = MEMORY * (threads * ratio + 1);
+
+    m_flags |= HugepagesAvailable;
+
+    m_memory = static_cast<uint8_t*>(mmap(0, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB | MAP_POPULATE, 0, 0));
+
+    if (m_memory == MAP_FAILED) {
+        m_memory = static_cast<uint8_t*>(_mm_malloc(size, 16));
+        return true;
+    }
+
+    m_flags |= HugepagesEnabled;
+
+    if (madvise(m_memory, size, MADV_RANDOM | MADV_WILLNEED) != 0) {
+        LOG_ERR("madvise failed");
+    }
+
+    if (mlock(m_memory, size) == 0) {
+        m_flags |= Lock;
+    }
+
+    return true;
+}
+
+
+void Mem::release()
+{
+    const int size = MEMORY * (m_threads + 1);
+
+    if (m_flags & HugepagesEnabled) {
+        if (m_flags & Lock) {
+            munlock(m_memory, size);
+        }
+
+        munmap(m_memory, size);
+    }
+    else {
+        _mm_free(m_memory);
+    }
+}