kexec, x86: Need a new e820 type support for kexec

From: Toshi Kani <toshi.kani@hp.com>
To: kexec@lists.infradead.org
Cc: linux-nvdimm@lists.01.org
Subject: kexec, x86: Need a new e820 type support for kexec
Date: Thu, 23 Jul 2015 18:26:32 -0600	[thread overview]
Message-ID: <1437697592.3214.373.camel@hp.com> (raw)

Hello,

ACPI 6.0 defines a new type in e820, AddressRangePersistentMemory (7), for
NVDIMM.  On a system with NVDIMM, kexec displays the following error
message and sets it to RANGE_RESERVED as the fallback type.

Unknown type (Persistent Memory) while parsing
/sys/firmware/memmap/34/type. Please report this as bug. Using
RANGE_RESERVED now.

This new type is defined in "arch/x86/include/uapi/asm/e820.h" in 4.2-rc1
as follows. 

  #define E820_PMEM       7

kexec needs to know this new type, but I think its build env includes
"/usr/include/asm/e820.h", which is provided by a distribution.  On Fedora
22, kernel-headers-4.0.6-300.fc22.x86_64 is the latest kernel header
package and it will take a while for 4.2 headers.

How do we handle such kernel header dependency in the kexec build env?

Thanks,
-Toshi

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