linux-kernel - [PATCH v2] arm64: add ARM64-specific support for flatmem

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Message-Id: <20180706170215.56116-1-nkela@cisco.com>
Date:   Fri,  6 Jul 2018 10:02:15 -0700
From:   Nikunj Kela <nkela@...co.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>
Cc:     xe-kernel@...ernal.cisco.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] 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@...ernal.cisco.com
Cc: Nikunj Kela <nkela@...co.com>
Signed-off-by: Nikunj Kela <nkela@...co.com>
---
 arch/arm64/Kconfig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 42c090c..96ab9a7 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -775,6 +775,10 @@ config ARCH_SPARSEMEM_DEFAULT
 config ARCH_SELECT_MEMORY_MODEL
 	def_bool ARCH_SPARSEMEM_ENABLE
 
+config ARCH_FLATMEM_ENABLE
+	def_bool y
+	depends on !NUMA
+
 config HAVE_ARCH_PFN_VALID
 	def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
 
-- 
2.10.3.dirty