The patch titled
Subject: memory-hotplug: add move_pfn_range()
has been added to the -mm tree. Its filename is
memory-hotplug-add-move_pfn_range.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/memory-hotplug-add-move_pfn_range.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/memory-hotplug-add-move_pfn_range.patch
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The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Reza Arbab <arbab@xxxxxxxxxxxxxxxxxx>
Subject: memory-hotplug: add move_pfn_range()
Add move_pfn_range(), a wrapper to call move_pfn_range_left() or
move_pfn_range_right().
No functional change. This will be utilized by a later patch.
Link: http://lkml.kernel.org/r/1462816419-4479-2-git-send-email-arbab@xxxxxxxxxxxxxxxxxx
Signed-off-by: Reza Arbab <arbab@xxxxxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Tang Chen <tangchen@xxxxxxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: David Vrabel <david.vrabel@xxxxxxxxxx>
Cc: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Andrew Banman <abanman@xxxxxxx>
Cc: Chen Yucong <slaoub@xxxxxxxxx>
Cc: Yasunori Goto <y-goto@xxxxxxxxxxxxxx>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
Cc: Zhang Zhen <zhenzhang.zhang@xxxxxxxxxx>
Cc: Shaohua Li <shaohua.li@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory_hotplug.c | 38 ++++++++++++++++++++++++++++----------
1 file changed, 28 insertions(+), 10 deletions(-)
diff -puN mm/memory_hotplug.c~memory-hotplug-add-move_pfn_range mm/memory_hotplug.c
--- a/mm/memory_hotplug.c~memory-hotplug-add-move_pfn_range
+++ a/mm/memory_hotplug.c
@@ -449,6 +449,25 @@ out_fail:
return -1;
}
+static struct zone * __meminit move_pfn_range(int zone_shift,
+ unsigned long start_pfn, unsigned long end_pfn)
+{
+ struct zone *zone = page_zone(pfn_to_page(start_pfn));
+ int ret = 0;
+
+ if (zone_shift < 0)
+ ret = move_pfn_range_left(zone + zone_shift, zone,
+ start_pfn, end_pfn);
+ else if (zone_shift)
+ ret = move_pfn_range_right(zone, zone + zone_shift,
+ start_pfn, end_pfn);
+
+ if (ret)
+ return NULL;
+
+ return zone + zone_shift;
+}
+
static void __meminit grow_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn,
unsigned long end_pfn)
{
@@ -1039,6 +1058,7 @@ int __ref online_pages(unsigned long pfn
int nid;
int ret;
struct memory_notify arg;
+ int zone_shift = 0;
/*
* This doesn't need a lock to do pfn_to_page().
@@ -1053,18 +1073,16 @@ int __ref online_pages(unsigned long pfn
return -EINVAL;
if (online_type == MMOP_ONLINE_KERNEL &&
- zone_idx(zone) == ZONE_MOVABLE) {
- if (move_pfn_range_left(zone - 1, zone, pfn, pfn + nr_pages))
- return -EINVAL;
- }
+ zone_idx(zone) == ZONE_MOVABLE)
+ zone_shift = -1;
+
if (online_type == MMOP_ONLINE_MOVABLE &&
- zone_idx(zone) == ZONE_MOVABLE - 1) {
- if (move_pfn_range_right(zone, zone + 1, pfn, pfn + nr_pages))
- return -EINVAL;
- }
+ zone_idx(zone) == ZONE_MOVABLE - 1)
+ zone_shift = 1;
- /* Previous code may changed the zone of the pfn range */
- zone = page_zone(pfn_to_page(pfn));
+ zone = move_pfn_range(zone_shift, pfn, pfn + nr_pages);
+ if (!zone)
+ return -EINVAL;
arg.start_pfn = pfn;
arg.nr_pages = nr_pages;
_
Patches currently in -mm which might be from arbab@xxxxxxxxxxxxxxxxxx are
memory-hotplug-add-move_pfn_range.patch
memory-hotplug-more-general-validation-of-zone-during-online.patch
memory-hotplug-use-zone_can_shift-for-sysfs-valid_zones-attribute.patch
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