# \[PATCH 3/4\] arm64: select HAVE\_MOVE\_PMD for faster mremap (v1)

- From: Joel Fernandes (Google) \<hidden\>
- Date: 2018-10-13 01:32:27 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2018/10/6489753
- Thread: https://ratatoskr.run/linux-alpha/2018/10/6489750/t.md

```text
Moving page-tables at the PMD-level on arm64 is known to be safe. Enable
this option so that we can do fast mremap when possible.

Signed-off-by: Joel Fernandes (Google) <redacted>
---
 arch/arm64/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 1b1a0e95c751..5d7c35c6f90c 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -135,6 +135,7 @@ config ARM64
 	select HAVE_IRQ_TIME_ACCOUNTING
 	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP if NUMA
+	select HAVE_MOVE_PMD
 	select HAVE_NMI
 	select HAVE_PATA_PLATFORM
 	select HAVE_PERF_EVENTS
-- 
2.19.0.605.g01d371f741-goog

```