[PATCH]IA64: assign a distinguishable label to uncached memory in

[Jay Lan <jlan@sgi.com>]

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Currently a memory segment in memory map with attribute of EFI_MEMORY_UC
is denoted as "System RAM" in /proc/iomem, while memory of attribute
(EFI_MEMORY_WB|EFI_MEMORY_UC) is also labeled the same.

The kexec utility then includes uncached memory as part of vmcore. The
kdump kernel MCA'ed when it tries to save the vmcore to a disk. A normal
"cached" access may cause MCAs.

This patch would label memory with attribute of EFI_MEMORY_UC only as
"Uncached RAM" so that kexec would know not to include it in the vmcore.
I will submit a separate kexec-tools patch to the kexec list.

Signed-off-by: Jay Lan <jlan@sgi.com>



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---
 arch/ia64/kernel/efi.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Index: linux/arch/ia64/kernel/efi.c
===================================================================
--- linux.orig/arch/ia64/kernel/efi.c
+++ linux/arch/ia64/kernel/efi.c
@@ -1232,9 +1232,10 @@ efi_initialize_iomem_resources(struct re
 				if (md->attribute & EFI_MEMORY_WP) {
 					name = "System ROM";
 					flags |= IORESOURCE_READONLY;
-				} else {
-					name = "System RAM";
-				}
+				} else if (md->attribute == EFI_MEMORY_UC)
+						name = "Uncached RAM";
+					else
+						name = "System RAM";
 				break;
 
 			case EFI_ACPI_MEMORY_NVS: