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. Cc: Andrew Morton <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Wei Yang <[email protected]> Cc: Baoquan He <[email protected]> Cc: Pankaj Gupta <[email protected]> Cc: Oscar Salvador <[email protected]> Signed-off-by: David Hildenbrand <[email protected]> --- mm/memory_hotplug.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 50aa5df696e9d..098361fcb4504 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1460,10 +1460,10 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages) { 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) */ @@ -1507,7 +1507,6 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages) reason = "failure to isolate range"; goto failed_removal; } - nr_isolate_pageblock = ret; arg.start_pfn = start_pfn; arg.nr_pages = nr_pages; @@ -1569,7 +1568,7 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages) * 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 */ -- 2.26.2
