linux-kernel - [PATCH V2] x86/boot/e820: add new chareater - to free BIOS memory in memmap bootargs

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Date:   Tue, 10 Apr 2018 10:59:11 +0800
From:   zoucao@...ux.alibaba.com
To:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH V2] x86/boot/e820: add new chareater - to free BIOS memory in memmap bootargs

this is useing memmap=0x4101000-0x6aeff000 to free BIOS reserved memory
"6aeff000-6effffff : reserved":

	......
	00100000-6aefefff : System RAM
	01000000-0165537a : Kernel code
	0165537b-01a8873f : Kernel data
	01c31000-01f4efff : Kernel bss
	28000000-320fffff : Crash kernel
	6aeff000-6effffff : reserved       --> it is e820 reserved memory
	6f000000-78240fff : System RAM
	......


add bootargs memmap=0x4101000-0x6aeff000, to free memory region: 6aeff000-6effffff
then 6aeff000-6effffff will be merged into 00100000-78240fff.

new iomem:
	cat /proc/iomem:
	......
	00100000-78240fff : System RAM
	01000000-0165537a : Kernel code
	0165537b-01a8873f : Kernel data
	01c31000-01f4efff : Kernel bss
	......


V1>V2: fixed the wrong chareaters

zoucao (1):
      x86/boot/e820: add new chareater "-" to free BIOS memory in memmap bootargs

 7u/Documentation/kernel-parameters.txt | 6 ++++++
 7u/arch/x86/kernel/e820.c              | 3 +++
 2 files changed, 9 insertions(+)