[PATCH 02/18] hugetlb_vmemmap: Move vmemmap_get_tail up

[James Houghton <jthoughton@google.com>]

In a follow-up patch, it will be used in
vmemmap_remap_alloc().

No functional change intended.

Signed-off-by: James Houghton <jthoughton@google.com>
---
 mm/hugetlb_vmemmap.c | 52 ++++++++++++++++++++++----------------------
 1 file changed, 26 insertions(+), 26 deletions(-)

diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c
index da29954e9533..8d4e8ee51fdd 100644
--- a/mm/hugetlb_vmemmap.c
+++ b/mm/hugetlb_vmemmap.c
@@ -355,6 +355,32 @@ static int alloc_vmemmap_page_list(unsigned long start, unsigned long end,
 	return -ENOMEM;
 }
 
+static struct page *vmemmap_get_tail(unsigned int order, struct zone *zone)
+{
+	const unsigned int idx = order - VMEMMAP_TAIL_MIN_ORDER;
+	struct page *tail, *p;
+	int node = zone_to_nid(zone);
+
+	tail = READ_ONCE(zone->vmemmap_tails[idx]);
+	if (likely(tail))
+		return tail;
+
+	tail = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0);
+	if (!tail)
+		return NULL;
+
+	p = page_to_virt(tail);
+	for (int i = 0; i < PAGE_SIZE / sizeof(struct page); i++)
+		init_compound_tail(p + i, NULL, order, zone);
+
+	if (cmpxchg(&zone->vmemmap_tails[idx], NULL, tail)) {
+		__free_page(tail);
+		tail = READ_ONCE(zone->vmemmap_tails[idx]);
+	}
+
+	return tail;
+}
+
 /**
  * vmemmap_remap_alloc - remap the vmemmap virtual address range [@start, end)
  *			 to the page which is from the @vmemmap_pages
@@ -491,32 +517,6 @@ static bool vmemmap_should_optimize_folio(const struct hstate *h, struct folio *
 	return true;
 }
 
-static struct page *vmemmap_get_tail(unsigned int order, struct zone *zone)
-{
-	const unsigned int idx = order - VMEMMAP_TAIL_MIN_ORDER;
-	struct page *tail, *p;
-	int node = zone_to_nid(zone);
-
-	tail = READ_ONCE(zone->vmemmap_tails[idx]);
-	if (likely(tail))
-		return tail;
-
-	tail = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0);
-	if (!tail)
-		return NULL;
-
-	p = page_to_virt(tail);
-	for (int i = 0; i < PAGE_SIZE / sizeof(struct page); i++)
-		init_compound_tail(p + i, NULL, order, zone);
-
-	if (cmpxchg(&zone->vmemmap_tails[idx], NULL, tail)) {
-		__free_page(tail);
-		tail = READ_ONCE(zone->vmemmap_tails[idx]);
-	}
-
-	return tail;
-}
-
 static int __hugetlb_vmemmap_optimize_folio(const struct hstate *h,
 					    struct folio *folio,
 					    struct list_head *vmemmap_pages,
-- 
2.55.0.795.g602f6c329a-goog