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[IA64] kexec fails on systems with blocks of uncached memory

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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>
Acked-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Jay Lan 2008-09-22 14:21:19 -07:00 committed by Tony Luck
parent 06f95ea898
commit d3758f87f3
1 changed files with 3 additions and 2 deletions
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5
arch/ia64/kernel/efi.c
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@ -1232,9 +1232,10 @@ efi_initialize_iomem_resources(struct resource *code_resource,
if (md->attribute & EFI_MEMORY_WP) {
name = "System ROM";
flags |= IORESOURCE_READONLY;
} else {
} else if (md->attribute == EFI_MEMORY_UC)
name = "Uncached RAM";
else
name = "System RAM";
}
break;
case EFI_ACPI_MEMORY_NVS: