diff -up mozilla-esr31/js/src/assembler/wtf/Platform.h.ppc64le mozilla-esr31/js/src/assembler/wtf/Platform.h
--- mozilla-esr31/js/src/assembler/wtf/Platform.h.ppc64le	2014-11-25 12:23:26.000000000 +0100
+++ mozilla-esr31/js/src/assembler/wtf/Platform.h	2014-12-19 16:51:25.579571933 +0100
@@ -179,6 +179,8 @@
 #define WTF_CPU_PPC64 1
 #if !defined(__LITTLE_ENDIAN__)
 #define WTF_CPU_BIG_ENDIAN 1
+#else
+#define WTF_CPU_PPC64LE 1
 #endif
 #endif
 
diff -up mozilla-esr31/js/src/gc/Memory.cpp.ppc64le mozilla-esr31/js/src/gc/Memory.cpp
--- mozilla-esr31/js/src/gc/Memory.cpp.ppc64le	2014-11-25 12:23:26.000000000 +0100
+++ mozilla-esr31/js/src/gc/Memory.cpp	2014-12-19 16:51:25.579571933 +0100
@@ -303,6 +303,9 @@ gc::MarkPagesUnused(JSRuntime *rt, void
 bool
 gc::MarkPagesInUse(JSRuntime *rt, void *p, size_t size)
 {
+    if (!DecommitEnabled(rt))
+        return false;
+
     JS_ASSERT(uintptr_t(p) % rt->gcSystemPageSize == 0);
     return true;
 }
diff -up mozilla-esr31/js/src/yarr/BumpPointerAllocator.h.ppc64le mozilla-esr31/js/src/yarr/BumpPointerAllocator.h
--- mozilla-esr31/js/src/yarr/BumpPointerAllocator.h.ppc64le	2014-11-25 12:23:30.000000000 +0100
+++ mozilla-esr31/js/src/yarr/BumpPointerAllocator.h	2014-12-19 16:51:25.579571933 +0100
@@ -38,6 +38,8 @@ namespace WTF {
 #define MINIMUM_BUMP_POOL_SIZE 0x2000
 #elif WTF_CPU_IA64
 #define MINIMUM_BUMP_POOL_SIZE 0x4000
+#elif WTF_CPU_PPC64LE
+#define MINIMUM_BUMP_POOL_SIZE 0x10000
 #else
 #define MINIMUM_BUMP_POOL_SIZE 0x1000
 #endif
diff -up mozilla-esr31/memory/mozjemalloc/jemalloc.c.ppc64le mozilla-esr31/memory/mozjemalloc/jemalloc.c
--- mozilla-esr31/memory/mozjemalloc/jemalloc.c.ppc64le	2014-12-19 16:51:25.580571935 +0100
+++ mozilla-esr31/memory/mozjemalloc/jemalloc.c	2014-12-19 16:52:11.754626429 +0100
@@ -596,7 +596,7 @@ static const bool isthreaded = true;
 #define	RUN_MAX_OVRHD_RELAX	0x00001800U
 
 /* Put a cap on small object run size.  This overrides RUN_MAX_OVRHD. */
-#define	RUN_MAX_SMALL_2POW	15
+#define	RUN_MAX_SMALL_2POW	16
 #define	RUN_MAX_SMALL		(1U << RUN_MAX_SMALL_2POW)
 
 /*