[Patch 5/8] powerpc: add CONFIG_KEXEC_AUTO_RESERVE

[Amerigo Wang]

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.
 
+config KEXEC_AUTO_RESERVE
+	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.
+
 config CRASH_DUMP
 	bool "Build a kdump crash kernel"
 	depends on PPC64 || 6xx
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