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Subject[Patch 1/8] x86: add CONFIG_KEXEC_AUTO_RESERVE

Introduce a new config option KEXEC_AUTO_RESERVE for x86.

Signed-off-by: WANG Cong <>
Acked-by: Neil Horman <>


Index: linux-2.6/arch/x86/Kconfig
--- linux-2.6.orig/arch/x86/Kconfig
+++ linux-2.6/arch/x86/Kconfig
@@ -1482,6 +1482,19 @@ 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 4G memory.
+ On x86_32, 128M is reserved, on x86_64 1/32 of your memory is
+ reserved, but it will not exceed 4G.
bool "kernel crash dumps"
depends on X86_64 || (X86_32 && HIGHMEM)

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