Some base/ progress towards building on Linux x86-64.

base/atomicops_internals_x86_gcc.h

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file is an internal atomic implementation, use base/atomicops.h instead.
 
 #ifndef BASE_ATOMICOPS_INTERNALS_X86_GCC_H_
 #define BASE_ATOMICOPS_INTERNALS_X86_GCC_H_
 
 // This struct is not part of the public API of this module; clients may not
@@ skipping 220 matching lines @@
                          // for current AMD/Intel chips as of Jan 2008.
                          // See also Release_Store(), above.
   ATOMICOPS_COMPILER_BARRIER();
   return value;
 }
 
 inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
   MemoryBarrier();
   return *ptr;
 }
+
+inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
+                                       Atomic64 old_value,
+                                       Atomic64 new_value) {
+  Atomic64 x = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
+  if (AtomicOps_Internalx86CPUFeatures.has_amd_lock_mb_bug) {
+    __asm__ __volatile__("lfence" : : : "memory");
+  }
+  return x;
+}
+
+inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
+                                       Atomic64 old_value,
+                                       Atomic64 new_value) {
+  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
+}
+
 #endif  // defined(__x86_64__)
 
 } // namespace base::subtle
 } // namespace base
 
 #undef ATOMICOPS_COMPILER_BARRIER
 
 #endif  // BASE_ATOMICOPS_INTERNALS_X86_GCC_H_