[PATCH v4] makedumpfile: Support to filter dump for kernels that use CONFIG_SPARSEMEM_VMEMMAP

[Vivek Goyal]

On Fri, Nov 22, 2013 at 06:01:55PM +0530, Hari Bathini wrote:
> Makedumpfile fails to filter dump for kernels build with CONFIG_SPARSEMEM_VMEMMAP
> enabled as it fails to do vmemmap translations. So far, makedumpfile on ppc64 never
> had to deal with vmemmap addresses (vmemmap regions) seperately to filter ppc64
> crash dumps as vmemmap regions where mapped in zone normal. But with the inclusion
> of CONFIG_SPARSEMEM_VMEMMAP config option in recent kernels, vmemmap memory regions
> are mapped outside zone normal. There is a need to handle vmemmap to physical address
> translation seperately in this scenario. This patch provides support in makedumpfile
> tool to do vmemmap to physical address translation when vmemmap regions are mapped
> outside zone normal. Some kernel symbols are needed in vmcoreinfo for this changes to
> be effective. The kernel patch that adds the necessary symbols to vmcoreinfo has been
> posted to linuxppc devel mailing list. This patch is influenced by vmemmap to physical
> address translation support code in crash utility. It is has been tested successfully
> at all dump filtering levels on kernel dumps that have CONFIG_SPARSEMEM_VMEMMAP enabled
> and kernel dumps with CONFIG_SPARSEMEM_VMEMMAP disabled as well. Also, successfully
> tested dump filtering on already filtered vmcores (re-filtering).

Please column width smaller (say 70) for changelogs. This looks messy.

Thanks
Vivek