From e7d4bac428edb806c5f5d903ab8850ffbe0ed9ce Mon Sep 17 00:00:00 2001 From: Nikunj Kela Date: Fri, 6 Jul 2018 10:47:24 -0700 Subject: [PATCH] arm64: add ARM64-specific support for flatmem Flatmem is useful in reducing kernel memory usage. One usecase is in kdump kernel. We are able to save ~14M by moving to flatmem scheme. Cc: xe-kernel@external.cisco.com Cc: Nikunj Kela Signed-off-by: Nikunj Kela Signed-off-by: Will Deacon --- arch/arm64/Kconfig | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 476de9b..c548b3d 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -786,6 +786,9 @@ config ARCH_SPARSEMEM_DEFAULT config ARCH_SELECT_MEMORY_MODEL def_bool ARCH_SPARSEMEM_ENABLE +config ARCH_FLATMEM_ENABLE + def_bool y + config HAVE_ARCH_PFN_VALID def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM -- 2.7.4