[PATCH 15/15] mm: enable CONFIG_ANON_VMA_LAZY on arm64 and x86_64

[tao]

All prerequisites are in place, so enable CONFIG_ANON_VMA_LAZY for
arm64 and x86_64.

Signed-off-by: tao <tao.wangtao@xxxxxxxxx>
---
 arch/arm64/Kconfig | 1 +
 arch/x86/Kconfig   | 1 +
 mm/rmap.c          | 2 +-
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index fe60738e5943..9517883f0aaf 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -81,6 +81,7 @@ config ARM64
 	select ARCH_SUPPORTS_NUMA_BALANCING
 	select ARCH_SUPPORTS_PAGE_TABLE_CHECK
 	select ARCH_SUPPORTS_PER_VMA_LOCK
+	select ARCH_SUPPORTS_ANON_VMA_LAZY
 	select ARCH_SUPPORTS_HUGE_PFNMAP if TRANSPARENT_HUGEPAGE
 	select ARCH_SUPPORTS_RT
 	select ARCH_SUPPORTS_SCHED_SMT
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index f3f7cb01d69d..cc3430eaa7b4 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -28,6 +28,7 @@ config X86_64
 	select ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS
 	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
 	select ARCH_SUPPORTS_PER_VMA_LOCK
+	select ARCH_SUPPORTS_ANON_VMA_LAZY
 	select ARCH_SUPPORTS_HUGE_PFNMAP if TRANSPARENT_HUGEPAGE
 	select HAVE_ARCH_SOFT_DIRTY
 	select MODULES_USE_ELF_RELA
diff --git a/mm/rmap.c b/mm/rmap.c
index e14509b47412..77e2ab95671a 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -168,7 +168,7 @@ static struct kmem_cache *anon_vma_chain_cachep;
  *        covering both regular anon_vma and lazy anon_vma mappings.
  */
 
-bool anon_vma_lazy_enable;
+bool anon_vma_lazy_enable = true;
 #endif
 
 static inline struct anon_vma *anon_vma_alloc(void)
-- 
2.17.1