[PATCH 6/6] arm64/mm: Enable ZONE_DEVICE

[Anshuman Khandual]

Arch implementation for functions which create or destroy vmemmap mapping
(vmemmap_populate, vmemmap_free) can comprehend and allocate from inside
device memory range through driver provided vmem_altmap structure which
fulfils all requirements to enable ZONE_DEVICE on the platform. Hence just
enable ZONE_DEVICE by subscribing to ARCH_HAS_ZONE_DEVICE. But this is only
applicable for ARM64_4K_PAGES (ARM64_SWAPPER_USES_SECTION_MAPS) only which
creates vmemmap section mappings and utilize vmem_altmap structure.

Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
---
 arch/arm64/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index db3e625..b5d8cf5 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -31,6 +31,7 @@ config ARM64
 	select ARCH_HAS_SYSCALL_WRAPPER
 	select ARCH_HAS_TEARDOWN_DMA_OPS if IOMMU_SUPPORT
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
+	select ARCH_HAS_ZONE_DEVICE if ARM64_4K_PAGES
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG
 	select ARCH_INLINE_READ_LOCK if !PREEMPT
 	select ARCH_INLINE_READ_LOCK_BH if !PREEMPT
-- 
2.7.4