[request for stable inclusion] ARM: 7815/1: kexec: offline non panic CPUs on Kdump panic

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hi Greg,

4f9b4fb7a2091eec339413a460b1665758401828
ARM: 7815/1: kexec: offline non panic CPUs on Kdump panic

This looks applicable to stable-3.10, that offlines non panic CPUs on
Kdump panic. Without this patch, the Kdump panic process will abort when
checking number of online CPUS in function machine_kexec, with message
"kexec: error: multiple CPUs still online".

I have tested this issue in pandaboard es(omap 4460). Before applying
this patch, the Kdump panic process abort just as the patch author
wrote. When I applied the patch, this step passed. The patch was
built successfully for me.

Thanks,
Liu Hua

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