[PATCH] To crash dump, we need keep other memory type exceptE820_RAM, because other type come from BIOS or firmware isused by other code(for example: PCI_MMCONFIG).

[jzha144]

Signed-off-by: jzha144 <jun.zhang@xxxxxxxxx>
---
 arch/x86/kernel/e820.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index df06ade..8760427 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -851,6 +851,15 @@ static int __init parse_memmap_opt(char *p)
 		 * reset.
 		 */
 		saved_max_pfn = e820_end_of_ram_pfn();
+
+		/*
+		 * To CRASH DUMP, only remove E820_RAM.
+		 *  some other memory typecome from BIOS or firmware,
+		 * it must be same with system kernel.
+		 */
+		e820_remove_range(0, ULLONG_MAX, E820_RAM, 1);
+		userdef = 1;
+		return 0;
 #endif
 		e820.nr_map = 0;
 		userdef = 1;
-- 
1.7.6

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