[Patch 5/8] powerpc: add CONFIG_KEXEC_AUTO_RESERVE

From: Amerigo Wang
Date: Wed Aug 26 2009 - 23:17:27 EST

Introduce a new config option KEXEC_AUTO_RESERVE for powerpc.

Signed-off-by: WANG Cong <amwang@xxxxxxxxxx>
Acked-by: Neil Horman <nhorman@xxxxxxxxxxxxx>


Index: linux-2.6/arch/powerpc/Kconfig
--- linux-2.6.orig/arch/powerpc/Kconfig
+++ linux-2.6/arch/powerpc/Kconfig
@@ -346,6 +346,17 @@ config KEXEC
support. As of this writing the exact hardware interface is
strongly in flux, so no good recommendation can be made.

+ bool "automatically reserve memory for kexec kernel"
+ depends on KEXEC
+ default y
+ ---help---
+ Automatically reserve memory for a kexec kernel, so that you don't
+ need to specify numbers for the "crashkernel=X@Y" boot option,
+ instead you can use "crashkernel=auto". To make this work, you need
+ to have more than 2G memory. On PPC, 128M or 256M is reserved, on
+ PPC64 1/32 of your physical memory, but it will not exceed 4G.
bool "Build a kdump crash kernel"
depends on PPC64 || 6xx
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