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Index: chromium-139.0.7258.66/base/allocator/dispatcher/tls.h
===================================================================
--- chromium-139.0.7258.66.orig/base/allocator/dispatcher/tls.h
+++ chromium-139.0.7258.66/base/allocator/dispatcher/tls.h
@@ -83,6 +83,8 @@ struct BASE_EXPORT MMapAllocator {
constexpr static size_t AllocationChunkSize = 16384;
#elif BUILDFLAG(IS_LINUX) && defined(ARCH_CPU_ARM64)
constexpr static size_t AllocationChunkSize = 16384;
+#elif BUILDFLAG(IS_LINUX) && defined(ARCH_CPU_PPC64)
+ constexpr static size_t AllocationChunkSize = 16384;
#else
constexpr static size_t AllocationChunkSize = 4096;
#endif
Index: chromium-139.0.7258.66/base/allocator/partition_allocator/src/partition_alloc/partition_alloc_constants.h
===================================================================
--- chromium-139.0.7258.66.orig/base/allocator/partition_allocator/src/partition_alloc/partition_alloc_constants.h
+++ chromium-139.0.7258.66/base/allocator/partition_allocator/src/partition_alloc/partition_alloc_constants.h
@@ -392,7 +392,7 @@ PA_ALWAYS_INLINE constexpr size_t MaxDir
// TODO(casey.smalley@arm.com): under 64k pages we can end up in a situation
// where a normal slot span will be large enough to contain multiple items,
// but the address will go over the final partition page after being aligned.
-#if PA_BUILDFLAG(IS_LINUX) && PA_BUILDFLAG(PA_ARCH_CPU_ARM64)
+#if PA_BUILDFLAG(IS_LINUX) && (PA_BUILDFLAG(PA_ARCH_CPU_ARM64) || PA_BUILDFLAG(PA_ARCH_CPU_PPC64))
constexpr size_t kMaxSupportedAlignment = kSuperPageSize / 4;
#else
constexpr size_t kMaxSupportedAlignment = kSuperPageSize / 2;
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