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
