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arm64: Make section size configurable for memory hotplug

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Currently On arm64, memory section size is hard-coded to 1G.
Make this configurable if memory-hotplug is enabled, to support
more finer granularity for hotplug-able memory.

Change-Id: Id889f93537df8ae7e72094b552cff735d31048e6
Signed-off-by: Sudarshan Rajagopalan <sudaraja@codeaurora.org>
[swatsrid@codeaurora.org: Fix merge conflicts]
Signed-off-by: Swathi Sridhar <swatsrid@codeaurora.org>
[isaacm@codeaurora.org: Remove unnecessary config dependency]
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
This commit is contained in:
Sudarshan Rajagopalan 2018-05-15 20:16:34 -07:00 • committed by Isaac J. Manjarres
commit d62cabc403
2 changed files with 15 additions and 0 deletions
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11
arch/arm64/Kconfig
View file

@ -282,6 +282,17 @@ config ARCH_ENABLE_MEMORY_HOTREMOVE
config SMP
def_bool y
config HOTPLUG_SIZE_BITS
int "Memory hotplug block size(29 => 512MB 30 => 1GB)"
depends on SPARSEMEM
depends on MEMORY_HOTPLUG
default 30
help
Selects granularity of hotplug memory. Block
size for memory hotplug is represent as a power
of 2.
If unsure, stick with default value.
config KERNEL_MODE_NEON
def_bool y

4
arch/arm64/include/asm/sparsemem.h
View file

@ -7,7 +7,11 @@
#ifdef CONFIG_SPARSEMEM
#define MAX_PHYSMEM_BITS CONFIG_ARM64_PA_BITS
#ifndef CONFIG_MEMORY_HOTPLUG
#define SECTION_SIZE_BITS 30
#else
#define SECTION_SIZE_BITS CONFIG_HOTPLUG_SIZE_BITS
#endif
#endif
#endif