+ mm-memory_hotplug-drop-nr_isolate_pageblock-in-offline_pages.patch added to -mm tree

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The patch titled
     Subject: mm/memory_hotplug: drop nr_isolate_pageblock in offline_pages()
has been added to the -mm tree.  Its filename is
     mm-memory_hotplug-drop-nr_isolate_pageblock-in-offline_pages.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-memory_hotplug-drop-nr_isolate_pageblock-in-offline_pages.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-memory_hotplug-drop-nr_isolate_pageblock-in-offline_pages.patch

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------------------------------------------------------
From: David Hildenbrand <david@xxxxxxxxxx>
Subject: mm/memory_hotplug: drop nr_isolate_pageblock in offline_pages()

We make sure that we cannot have any memory holes right at the beginning
of offline_pages() and we only support to online/offline full sections. 
Both, sections and pageblocks are a power of two in size, and sections
always span full pageblocks.

We can directly calculate the number of isolated pageblocks from nr_pages.

Link: https://lkml.kernel.org/r/20200819175957.28465-6-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Wei Yang <richard.weiyang@xxxxxxxxxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Pankaj Gupta <pankaj.gupta.linux@xxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Charan Teja Reddy <charante@xxxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Cc: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Michel Lespinasse <walken@xxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/memory_hotplug.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/mm/memory_hotplug.c~mm-memory_hotplug-drop-nr_isolate_pageblock-in-offline_pages
+++ a/mm/memory_hotplug.c
@@ -1462,10 +1462,10 @@ int __ref offline_pages(unsigned long st
 {
 	const unsigned long end_pfn = start_pfn + nr_pages;
 	unsigned long pfn, system_ram_pages = 0;
-	int ret, node, nr_isolate_pageblock;
 	unsigned long flags;
 	struct zone *zone;
 	struct memory_notify arg;
+	int ret, node;
 	char *reason;
 
 	/* We can only offline full sections (e.g., SECTION_IS_ONLINE) */
@@ -1509,7 +1509,6 @@ int __ref offline_pages(unsigned long st
 		reason = "failure to isolate range";
 		goto failed_removal;
 	}
-	nr_isolate_pageblock = ret;
 
 	arg.start_pfn = start_pfn;
 	arg.nr_pages = nr_pages;
@@ -1571,7 +1570,7 @@ int __ref offline_pages(unsigned long st
 	 * pageblocks zone counter here.
 	 */
 	spin_lock_irqsave(&zone->lock, flags);
-	zone->nr_isolate_pageblock -= nr_isolate_pageblock;
+	zone->nr_isolate_pageblock -= nr_pages / pageblock_nr_pages;
 	spin_unlock_irqrestore(&zone->lock, flags);
 
 	/* removal success */
_

Patches currently in -mm which might be from david@xxxxxxxxxx are

mm-page_alloc-tweak-comments-in-has_unmovable_pages.patch
mm-page_isolation-exit-early-when-pageblock-is-isolated-in-set_migratetype_isolate.patch
mm-page_isolation-drop-warn_on_once-in-set_migratetype_isolate.patch
mm-page_isolation-cleanup-set_migratetype_isolate.patch
virtio-mem-dont-special-case-zone_movable.patch
mm-document-semantics-of-zone_movable.patch
mm-memory_hotplug-inline-__offline_pages-into-offline_pages.patch
mm-memory_hotplug-enforce-section-granularity-when-onlining-offlining.patch
mm-memory_hotplug-simplify-page-offlining.patch
mm-page_alloc-simplify-__offline_isolated_pages.patch
mm-memory_hotplug-drop-nr_isolate_pageblock-in-offline_pages.patch
mm-page_isolation-simplify-return-value-of-start_isolate_page_range.patch
mm-memory_hotplug-simplify-page-onlining.patch
mm-page_alloc-drop-stale-pageblock-comment-in-memmap_init_zone.patch
mm-pass-migratetype-into-memmap_init_zone-and-move_pfn_range_to_zone.patch
mm-memory_hotplug-mark-pageblocks-migrate_isolate-while-onlining-memory.patch




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