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Subject[Patch 5/7] powerpc: add CONFIG_KEXEC_AUTO_RESERVE

Introduce a new config option KEXEC_AUTO_RESERVE for powerpc.

Signed-off-by: WANG Cong <>

Index: linux-2.6/arch/powerpc/Kconfig
--- linux-2.6.orig/arch/powerpc/Kconfig
+++ linux-2.6/arch/powerpc/Kconfig
@@ -346,6 +346,16 @@ 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".
+ On PPC, 256M is reserved and only when you have memory > 4G.
bool "Build a kdump crash kernel"
depends on PPC64 || 6xx

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