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

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Date:   Thu, 12 Jul 2018 14:36:10 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Oscar Salvador <osalvador@...hadventures.net>
Cc:     akpm@...ux-foundation.org, broonie@...nel.org, mhocko@...e.cz,
        sfr@...b.auug.org.au, linux-next@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, mm-commits@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, bhe@...hat.com,
        pasha.tatashin@...cle.com,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Subject: Re: Boot failures with "mm/sparse: Remove CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER" on powerpc (was Re: mmotm 2018-07-10-16-50 uploaded)

Oscar Salvador <osalvador@...hadventures.net> writes:

> On Wed, Jul 11, 2018 at 10:49:58PM +1000, Michael Ellerman wrote:
>> akpm@...ux-foundation.org writes:
>> > The mm-of-the-moment snapshot 2018-07-10-16-50 has been uploaded to
>> >
>> >    http://www.ozlabs.org/~akpm/mmotm/
>> ...
>> 
>> > * 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
>> 
>> > * 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.

It's a generated config, see:

  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/powerpc/Makefile?commit=021c91791a5e7e85c567452f1be3e4c2c6cb6063#n315


It's based on pseries_defconfig, which is an actual file in the tree,
but with the endian flipped.

You can see the generated result from a recent build here:

  http://kisskb.ellerman.id.au/kisskb/buildresult/13428803/config/


cheers