diff --git a/compiler-rt/lib/msan/msan_allocator.cc b/compiler-rt/lib/msan/msan_allocator.cc
--- a/compiler-rt/lib/msan/msan_allocator.cc
+++ b/compiler-rt/lib/msan/msan_allocator.cc
@@ -44,23 +44,24 @@
   }
 };
 
+struct DefaultMsanAllocatorParams : public DefaultAllocatorParams {
+  static const uptr kMetadataSize = sizeof(Metadata);
+  using MapUnmapCallback = MsanMapUnmapCallback;
+  using AddressSpaceView = LocalAddressSpaceView;
+};
+
 #if defined(__mips64)
 static const uptr kMaxAllowedMallocSize = 2UL << 30;
 static const uptr kRegionSizeLog = 20;
 static const uptr kNumRegions = SANITIZER_MMAP_RANGE_SIZE >> kRegionSizeLog;
 typedef TwoLevelByteMap<(kNumRegions >> 12), 1 << 12> ByteMap;
 
-struct AP32 {
+struct AP32 : public DefaultMsanAllocatorParams {
   static const uptr kSpaceBeg = 0;
   static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
-  static const uptr kMetadataSize = sizeof(Metadata);
   typedef __sanitizer::CompactSizeClassMap SizeClassMap;
   static const uptr kRegionSizeLog = __msan::kRegionSizeLog;
-  using AddressSpaceView = LocalAddressSpaceView;
   using ByteMap = __msan::ByteMap;
-  typedef MsanMapUnmapCallback MapUnmapCallback;
-  using PtrArray = DefaultLargeMmapAllocatorPtrArray;
-  static const uptr kFlags = 0;
 };
 typedef SizeClassAllocator32<AP32> PrimaryAllocator;
 #elif defined(__x86_64__)
@@ -72,15 +73,10 @@
 #endif
 static const uptr kMaxAllowedMallocSize = 8UL << 30;
 
-struct AP64 {  // Allocator64 parameters. Deliberately using a short name.
+struct AP64 : public DefaultMsanAllocatorParams {
   static const uptr kSpaceBeg = kAllocatorSpace;
   static const uptr kSpaceSize = 0x40000000000;  // 4T.
-  static const uptr kMetadataSize = sizeof(Metadata);
   typedef DefaultSizeClassMap SizeClassMap;
-  typedef MsanMapUnmapCallback MapUnmapCallback;
-  using PtrArray = DefaultLargeMmapAllocatorPtrArray;
-  static const uptr kFlags = 0;
-  using AddressSpaceView = LocalAddressSpaceView;
 };
 
 typedef SizeClassAllocator64<AP64> PrimaryAllocator;
@@ -88,15 +84,10 @@
 #elif defined(__powerpc64__)
 static const uptr kMaxAllowedMallocSize = 2UL << 30;  // 2G
 
-struct AP64 {  // Allocator64 parameters. Deliberately using a short name.
+struct AP64 : public DefaultMsanAllocatorParams {
   static const uptr kSpaceBeg = 0x300000000000;
   static const uptr kSpaceSize = 0x020000000000;  // 2T.
-  static const uptr kMetadataSize = sizeof(Metadata);
   typedef DefaultSizeClassMap SizeClassMap;
-  typedef MsanMapUnmapCallback MapUnmapCallback;
-  using PtrArray = DefaultLargeMmapAllocatorPtrArray;
-  static const uptr kFlags = 0;
-  using AddressSpaceView = LocalAddressSpaceView;
 };
 
 typedef SizeClassAllocator64<AP64> PrimaryAllocator;
@@ -106,17 +97,12 @@
 static const uptr kNumRegions = SANITIZER_MMAP_RANGE_SIZE >> kRegionSizeLog;
 typedef TwoLevelByteMap<(kNumRegions >> 12), 1 << 12> ByteMap;
 
-struct AP32 {
+struct AP32 : public DefaultMsanAllocatorParams {
   static const uptr kSpaceBeg = 0;
   static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
-  static const uptr kMetadataSize = sizeof(Metadata);
   typedef __sanitizer::CompactSizeClassMap SizeClassMap;
   static const uptr kRegionSizeLog = __msan::kRegionSizeLog;
-  using AddressSpaceView = LocalAddressSpaceView;
   using ByteMap = __msan::ByteMap;
-  typedef MsanMapUnmapCallback MapUnmapCallback;
-  using PtrArray = DefaultLargeMmapAllocatorPtrArray;
-  static const uptr kFlags = 0;
 };
 typedef SizeClassAllocator32<AP32> PrimaryAllocator;
 #endif
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_allocator_combined.h b/compiler-rt/lib/sanitizer_common/sanitizer_allocator_combined.h
--- a/compiler-rt/lib/sanitizer_common/sanitizer_allocator_combined.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_allocator_combined.h
@@ -13,6 +13,11 @@
 #error This file must be included inside sanitizer_allocator.h
 #endif
 
+struct DefaultAllocatorParams {
+  using PtrArray = DefaultLargeMmapAllocatorPtrArray;
+  static const uptr kFlags = 0;
+};
+
 // This class implements a complete memory allocator by using two
 // internal allocators:
 // PrimaryAllocator is efficient, but may not allocate some sizes (alignments).