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authorDavid Hildenbrand <david@redhat.com>2020-02-03 17:34:26 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-02-04 03:05:23 +0000
commit92917998849eea951707c8fea2dc3007bb2ad2cd (patch)
treeccaa9ea2dd048cc6c48caa7ac791c433a4dd7d0f /mm
parent52fb87c81f11daa7027af25fc24ac7974eb8f45a (diff)
mm/memory_hotplug: drop valid_start/valid_end from test_pages_in_a_zone()
The callers are only interested in the actual zone, they don't care about boundaries. Return the zone instead to simplify. Link: http://lkml.kernel.org/r/20200110183308.11849-1-david@redhat.com Signed-off-by: David Hildenbrand <david@redhat.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: "Rafael J. Wysocki" <rafael@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Oscar Salvador <osalvador@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memory_hotplug.c31
1 files changed, 9 insertions, 22 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 4344e85213f2..0a54ffac8c68 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1172,14 +1172,13 @@ bool is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages)
}
/*
- * Confirm all pages in a range [start, end) belong to the same zone.
- * When true, return its valid [start, end).
+ * Confirm all pages in a range [start, end) belong to the same zone (skipping
+ * memory holes). When true, return the zone.
*/
-int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
- unsigned long *valid_start, unsigned long *valid_end)
+struct zone *test_pages_in_a_zone(unsigned long start_pfn,
+ unsigned long end_pfn)
{
unsigned long pfn, sec_end_pfn;
- unsigned long start, end;
struct zone *zone = NULL;
struct page *page;
int i;
@@ -1200,24 +1199,15 @@ int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
continue;
/* Check if we got outside of the zone */
if (zone && !zone_spans_pfn(zone, pfn + i))
- return 0;
+ return NULL;
page = pfn_to_page(pfn + i);
if (zone && page_zone(page) != zone)
- return 0;
- if (!zone)
- start = pfn + i;
+ return NULL;
zone = page_zone(page);
- end = pfn + MAX_ORDER_NR_PAGES;
}
}
- if (zone) {
- *valid_start = start;
- *valid_end = min(end, end_pfn);
- return 1;
- } else {
- return 0;
- }
+ return zone;
}
/*
@@ -1462,7 +1452,6 @@ static int __ref __offline_pages(unsigned long start_pfn,
unsigned long offlined_pages = 0;
int ret, node, nr_isolate_pageblock;
unsigned long flags;
- unsigned long valid_start, valid_end;
struct zone *zone;
struct memory_notify arg;
char *reason;
@@ -1487,14 +1476,12 @@ static int __ref __offline_pages(unsigned long start_pfn,
/* This makes hotplug much easier...and readable.
we assume this for now. .*/
- if (!test_pages_in_a_zone(start_pfn, end_pfn, &valid_start,
- &valid_end)) {
+ zone = test_pages_in_a_zone(start_pfn, end_pfn);
+ if (!zone) {
ret = -EINVAL;
reason = "multizone range";
goto failed_removal;
}
-
- zone = page_zone(pfn_to_page(valid_start));
node = zone_to_nid(zone);
/* set above range as isolated */