Commit 0d0db072 authored May 21, 2022 by Peng Liu Committed by Zheng Zengkai May 21, 2022

Documentation: arm64: Add limitation for exactmap

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I56F4Z


CVE: NA

--------------------------------

For arm64, the exactmap has to remove all memblock and then add
the user assigned range of memblock. EFI initializes memblock too
late so removing all memblock after it will cause panic. Hence,
the exactmap can be just used in dt boot mode, add this limitation
to Documentation/admin-guide/kernel-parameters.txt.

Signed-off-by: Peng Liu <liupeng256@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>

parent f2a8c2b1

Documentation/admin-guide/kernel-parameters.txt

+2 −0

Original line number	Diff line number	Diff line
		@@ -2820,6 +2820,8 @@

		memmap=exactmap [KNL,X86,ARM64] Enable setting of an exact
		E820 and ARM64 memory map, as specified by the user.
		For ARM64, this setting is limited to dt boot mode as
		exact mapping must be done after initializing memblock.
		Such memmap=exactmap lines can be constructed based on
		BIOS output or other requirements. See the memmap=nn@ss
		option description.