Re: Boot failures with "mm/sparse: Remove CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER" on powerpc (was Re: mmotm 2018-07-10-16-50 uploaded)

On Wed, 11 Jul 2018 09:55:59 -0400 Pavel Tatashin [off-list ref] wrote:

On Wed, Jul 11, 2018 at 9:37 AM Oscar Salvador
[off-list ref] wrote:

quoted

On Wed, Jul 11, 2018 at 10:49:58PM +1000, Michael Ellerman wrote:

quoted

akpm@linux-foundation.org writes:

quoted

The mm-of-the-moment snapshot 2018-07-10-16-50 has been uploaded to

   http://www.ozlabs.org/~akpm/mmotm/

...

quoted

* mm-sparse-add-a-static-variable-nr_present_sections.patch
* mm-sparsemem-defer-the-ms-section_mem_map-clearing.patch
* mm-sparsemem-defer-the-ms-section_mem_map-clearing-fix.patch
* mm-sparse-add-a-new-parameter-data_unit_size-for-alloc_usemap_and_memmap.patch
* mm-sparse-optimize-memmap-allocation-during-sparse_init.patch
* mm-sparse-optimize-memmap-allocation-during-sparse_init-checkpatch-fixes.patch

quoted

* mm-sparse-remove-config_sparsemem_alloc_mem_map_together.patch

This seems to be breaking my powerpc pseries qemu boots.

The boot log with some extra debug shows eg:

  $ make pseries_le_defconfig

Could you please share the config?
I was not able to find such config in the kernel tree.

(top-posting repaired so I can reply to your email, add other people
and not confuse the heck out of them.  Please don't)

I am OK, if this patch is removed from Baoquan's series. But, I would
still like to get rid of CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER, I
can work on this in my sparse_init re-write series. ppc64 should
really fallback safely to small chunks allocs, and if it does not
there is some existing bug. Michael please send the config that you
used.

OK, I shall drop
mm-sparse-remove-config_sparsemem_alloc_mem_map_together.patch for now.