[PATCH 1/2] arm64: add kconfig symbol to configure section size
From: Nikunj Kela <hidden>
Date: 2018-07-02 21:14:26
Also in:
lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
Currently, section size is fixed to 1024MB. This change adds a config that would allow it to be customized. This could be useful in reducing kernel memory usage. Cc: xe-kernel at external.cisco.com Cc: Nikunj Kela <redacted> Signed-off-by: Nikunj Kela <redacted> --- arch/arm64/Kconfig | 15 +++++++++++++++ arch/arm64/include/asm/sparsemem.h | 2 +- 2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 42c090c..edf327f 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig@@ -687,6 +687,21 @@ config ARM64_PA_BITS default 48 if ARM64_PA_BITS_48 default 52 if ARM64_PA_BITS_52 +choice + prompt "Section size" + default ARM64_SEC_BITS_30 + help + Choose the maximum amount of memory in a section. + +config ARM64_SEC_BITS_30 + bool "30-bit" + +endchoice + +config ARM64_SEC_BITS + int + default 30 if ARM64_SEC_BITS_30 + config CPU_BIG_ENDIAN bool "Build big-endian kernel" help
diff --git a/arch/arm64/include/asm/sparsemem.h b/arch/arm64/include/asm/sparsemem.h
index b299929..dc8fb4b 100644
--- a/arch/arm64/include/asm/sparsemem.h
+++ b/arch/arm64/include/asm/sparsemem.h@@ -18,7 +18,7 @@ #ifdef CONFIG_SPARSEMEM #define MAX_PHYSMEM_BITS CONFIG_ARM64_PA_BITS -#define SECTION_SIZE_BITS 30 +#define SECTION_SIZE_BITS CONFIG_ARM64_SEC_BITS #endif #endif
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2.5.0