Messages in this thread Patch in this message | | | From | Andi Kleen <> | Subject | [PATCH] [1/3] x86: Improve CONFIG_KEXEC_JUMP description | Date | Sun, 6 Dec 2009 15:13:09 +0100 (CET) |
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I've been puzzling what CONFIG_KEXEC_JUMP was good for.
The Kconfig help was not very helpful in explaining why one want to set this option. This patch improves it a bit, based on the original commit log. It's still not fully clear, but then I couldn't find a concrete application anywhere.
Cc: ying.huang@intel.com Signed-off-by: Andi Kleen <ak@linux.intel.com>
--- arch/x86/Kconfig | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
Index: linux-2.6.32-ak/arch/x86/Kconfig =================================================================== --- linux-2.6.32-ak.orig/arch/x86/Kconfig +++ linux-2.6.32-ak/arch/x86/Kconfig @@ -1496,8 +1496,10 @@ config KEXEC_JUMP depends on EXPERIMENTAL depends on KEXEC && HIBERNATION ---help--- - Jump between original kernel and kexeced kernel and invoke - code in physical address mode via KEXEC + Allow to call code through kexec with paging turned off and then + return to the normal kernel. This can be used to call BIOS + code for example, and to implement kexec based hibernation. + Requires uptodate kexec tools. config PHYSICAL_START hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
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