linux-kernel - arm64: why set SECTION_SIZE

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Message-ID: <57AC490E.4080204@huawei.com>
Date:	Thu, 11 Aug 2016 17:44:46 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>
CC:	Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	<chenjie6@...wei.com>
Subject: 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