powerpc/numa: Skip onlining a offline node in kdump path

[Michael Ellerman]

On Fri, 2018-09-28 at 03:47:32 UTC, Srikar Dronamraju wrote:
> With Commit 2ea626306810 ("powerpc/topology: Get topology for shared
> processors at boot"), kdump kernel on shared lpar may crash.
> 
> The necessary conditions are
> - Shared Lpar with atleast 2 nodes having memory and CPUs.
> - Memory requirement for kdump kernel must be met by the first N-1 nodes
>   where there are atleast N nodes with memory and CPUs.
...
> 
> As part of fix, detect and skip early onlining of a offline node.
> 
> Fixes: 2ea626306810 ("powerpc/topology: Get topology for shared processors at boot")
> Reported-by: Pavithra Prakash <pavrampu at in.ibm.com>
> Signed-off-by: Srikar Dronamraju <srikar at linux.vnet.ibm.com>
> Tested-by: Hari Bathini <hbathini at linux.ibm.com>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/ac1788cc7da4ce54edcfd2e499afdb

cheers