[PATCH v2 0/4] Fix kmalloc_node on offline nodes

[Srikar Dronamraju <srikar@linux.vnet.ibm.com>]

Changelog v1 -> v2:
- Handled comments from Vlastimil Babka and Bharata B Rao
- Changes only in patch 2 and 4.

Sachin recently reported that linux-next was no more bootable on few
powerpc systems.
https://lore.kernel.org/linux-next/3381CD91-AB3D-4773-BA04-E7A072A63968@linux.vnet.ibm.com/

# numactl -H
available: 2 nodes (0-1)
node 0 cpus:
node 0 size: 0 MB
node 0 free: 0 MB
node 1 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
node 1 size: 35247 MB
node 1 free: 30907 MB
node distances:
node   0   1
  0:  10  40
  1:  40  10
#

Sachin bisected the problem to Commit a75056fc1e7c ("mm/memcontrol.c: allocate
shrinker_map on appropriate NUMA node")

The root cause analysis showed that mm/slub and powerpc/numa had some shortcomings
with respect to offline nodes.

This patch series is on top of patches posted at
https://lore.kernel.org/linuxppc-dev/20200311110237.5731-1-srikar@linux.vnet.ibm.com/t/#u

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Sachin Sant <sachinp@linux.vnet.ibm.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Christopher Lameter <cl@linux.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Bharata B Rao <bharata@linux.ibm.com>
Cc: Nathan Lynch <nathanl@linux.ibm.com>

Srikar Dronamraju (4):
  mm: Check for node_online in node_present_pages
  mm/slub: Use mem_node to allocate a new slab
  mm: Implement reset_numa_mem
  powerpc/numa: Set fallback nodes for offline nodes

 arch/powerpc/include/asm/topology.h | 16 ++++++++++++++++
 arch/powerpc/kernel/smp.c           |  1 +
 include/asm-generic/topology.h      |  3 +++
 include/linux/mmzone.h              |  6 ++++--
 include/linux/topology.h            |  7 +++++++
 mm/slub.c                           |  9 +++++----
 6 files changed, 36 insertions(+), 6 deletions(-)

-- 
2.18.1