arm64: why set SECTION_SIZE_BITS to 1G size?

Hi everyone:
arm64:
SECTION_SIZE_BITS 30 -----1G

The memory hotplug(add_memory -->check_hotplug_memory_range) must be aligned with section.So I can not add mem with 64M ... Can I modify the SECTION_SIZE_BITS to 26?

Thanks,
Xishi Qiu

There was a patch to reduce this to 27:

http://lkml.kernel.org/g/[email protected]

Also some discussions in this thread on a different patch:

http://lkml.iu.edu/hypermail/linux/kernel/1604.1/03036.html

Does your system really have such small alignment memory blocks?

Catalin

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