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Subject[PATCH v1 06/11] mm/memory_hotplug: drop nr_isolate_pageblock in offline_pages()
Date
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 <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
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
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