[RFC][PATCH v2 01/21] e820: cheat PMEM as DRAM

[Fengguang Wu]

From: Fan Du <fan...@intel.com>

This is a hack to enumerate PMEM as NUMA nodes.
It's necessary for current BIOS that don't yet fill ACPI HMAT table.

WARNING: take care to backup. It is mutual exclusive with libnvdimm
subsystem and can destroy ndctl managed namespaces.

Signed-off-by: Fan Du <fan...@intel.com>
Signed-off-by: Fengguang Wu <fengguang...@intel.com>
---
 arch/x86/kernel/e820.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- linux.orig/arch/x86/kernel/e820.c   2018-12-23 19:20:34.587078783 +0800
+++ linux/arch/x86/kernel/e820.c        2018-12-23 19:20:34.587078783 +0800
@@ -403,7 +403,8 @@ static int __init __append_e820_table(st
                /* Ignore the entry on 64-bit overflow: */
                if (start > end && likely(size))
                        return -1;
-
+               if (type == E820_TYPE_PMEM)
+                       type = E820_TYPE_RAM;
                e820__range_add(start, size, type);
 
                entry++;