The patch titled
Subject: mm/memory_hotplug: online_pages cannot be 0 in online_pages()
has been added to the -mm tree. Its filename is
mm-memory_hotplug-online_pages-cannot-be-0-in-online_pages.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-memory_hotplug-online_pages-cannot-be-0-in-online_pages.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-memory_hotplug-online_pages-cannot-be-0-in-online_pages.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: David Hildenbrand <david@xxxxxxxxxx>
Subject: mm/memory_hotplug: online_pages cannot be 0 in online_pages()
walk_system_ram_range() will fail with -EINVAL in case
online_pages_range() was never called (== no resource applicable in the
range). Otherwise, we will always call online_pages_range() with nr_pages
> 0 and, therefore, have online_pages > 0.
Remove that special handling.
Link: http://lkml.kernel.org/r/20190809125701.3316-5-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Arun KS <arunks@xxxxxxxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Nadav Amit <namit@xxxxxxxxxx>
Cc: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory_hotplug.c | 22 +++++++++-------------
1 file changed, 9 insertions(+), 13 deletions(-)
--- a/mm/memory_hotplug.c~mm-memory_hotplug-online_pages-cannot-be-0-in-online_pages
+++ a/mm/memory_hotplug.c
@@ -854,6 +854,7 @@ int __ref online_pages(unsigned long pfn
ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages,
online_pages_range);
if (ret) {
+ /* not a single memory resource was applicable */
if (need_zonelists_rebuild)
zone_pcp_reset(zone);
goto failed_addition;
@@ -867,27 +868,22 @@ int __ref online_pages(unsigned long pfn
shuffle_zone(zone);
- if (onlined_pages) {
- node_states_set_node(nid, &arg);
- if (need_zonelists_rebuild)
- build_all_zonelists(NULL);
- else
- zone_pcp_update(zone);
- }
+ node_states_set_node(nid, &arg);
+ if (need_zonelists_rebuild)
+ build_all_zonelists(NULL);
+ else
+ zone_pcp_update(zone);
init_per_zone_wmark_min();
- if (onlined_pages) {
- kswapd_run(nid);
- kcompactd_run(nid);
- }
+ kswapd_run(nid);
+ kcompactd_run(nid);
vm_total_pages = nr_free_pagecache_pages();
writeback_set_ratelimit();
- if (onlined_pages)
- memory_notify(MEM_ONLINE, &arg);
+ memory_notify(MEM_ONLINE, &arg);
mem_hotplug_done();
return 0;
_
Patches currently in -mm which might be from david@xxxxxxxxxx are
mm-memory_hotplug-remove-move_pfn_range.patch
drivers-base-nodec-simplify-unregister_memory_block_under_nodes.patch
drivers-base-memoryc-fixup-documentation-of-removable-phys_index-block_size_bytes.patch
driver-base-memoryc-validate-memory-block-size-early.patch
resource-use-pfn_up-pfn_down-in-walk_system_ram_range.patch
mm-memory_hotplug-handle-unaligned-start-and-nr_pages-in-online_pages_blocks.patch
mm-memory_hotplug-simplify-online_pages_range.patch
mm-memory_hotplug-online_pages-cannot-be-0-in-online_pages.patch
