linux-kernel - [PATCH 5/5] hugetlb: convert PageHugeFreed to HP

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Message-Id: <20210116003105.182918-6-mike.kravetz@oracle.com>
Date:   Fri, 15 Jan 2021 16:31:05 -0800
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     Michal Hocko <mhocko@...nel.org>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Muchun Song <songmuchun@...edance.com>,
        David Hildenbrand <david@...hat.com>,
        Oscar Salvador <osalvador@...e.de>,
        Matthew Wilcox <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: [PATCH 5/5] hugetlb: convert PageHugeFreed to HP_Freed flag

Use new hugetlb specific flag HP_Freed flag to replace the
PageHugeFreed interfaces.

Signed-off-by: Mike Kravetz <mike.kravetz@...cle.com>
---
 include/linux/hugetlb.h |  2 ++
 mm/hugetlb.c            | 23 ++++-------------------
 2 files changed, 6 insertions(+), 19 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 166825c85875..5c99969fbbd6 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -487,11 +487,13 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
  *	allocator.  Typically used for migration target pages when no pages
  *	are available in the pool.  The hugetlb free page path will
  *	immediately free pages with this flag set to the buddy allocator.
+ * HP_Freed - Set when page is on the free lists.
  */
 enum hugetlb_page_flags {
 	HP_Restore_Reserve = 0,
 	HP_Migratable,
 	HP_Temporary,
+	HP_Freed,
 };
 
 #ifdef CONFIG_HUGETLB_PAGE
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 53e9168a97bd..073137b32657 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -79,21 +79,6 @@ DEFINE_SPINLOCK(hugetlb_lock);
 static int num_fault_mutexes;
 struct mutex *hugetlb_fault_mutex_table ____cacheline_aligned_in_smp;
 
-static inline bool PageHugeFreed(struct page *head)
-{
-	return page_private(head + 4) == -1UL;
-}
-
-static inline void SetPageHugeFreed(struct page *head)
-{
-	set_page_private(head + 4, -1UL);
-}
-
-static inline void ClearPageHugeFreed(struct page *head)
-{
-	set_page_private(head + 4, 0);
-}
-
 /* Forward declaration */
 static int hugetlb_acct_memory(struct hstate *h, long delta);
 
@@ -1043,7 +1028,7 @@ static void enqueue_huge_page(struct hstate *h, struct page *page)
 	list_move(&page->lru, &h->hugepage_freelists[nid]);
 	h->free_huge_pages++;
 	h->free_huge_pages_node[nid]++;
-	SetPageHugeFreed(page);
+	hugetlb_set_page_flag(page, HP_Freed);
 }
 
 static struct page *dequeue_huge_page_node_exact(struct hstate *h, int nid)
@@ -1060,7 +1045,7 @@ static struct page *dequeue_huge_page_node_exact(struct hstate *h, int nid)
 
 		list_move(&page->lru, &h->hugepage_activelist);
 		set_page_refcounted(page);
-		ClearPageHugeFreed(page);
+		hugetlb_clear_page_flag(page, HP_Freed);
 		h->free_huge_pages--;
 		h->free_huge_pages_node[nid]--;
 		return page;
@@ -1474,7 +1459,7 @@ static void prep_new_huge_page(struct hstate *h, struct page *page, int nid)
 	spin_lock(&hugetlb_lock);
 	h->nr_huge_pages++;
 	h->nr_huge_pages_node[nid]++;
-	ClearPageHugeFreed(page);
+	hugetlb_clear_page_flag(page, HP_Freed);
 	spin_unlock(&hugetlb_lock);
 }
 
@@ -1747,7 +1732,7 @@ int dissolve_free_huge_page(struct page *page)
 		 * We should make sure that the page is already on the free list
 		 * when it is dissolved.
 		 */
-		if (unlikely(!PageHugeFreed(head))) {
+		if (unlikely(!hugetlb_test_page_flag(head, HP_Freed))) {
 			rc = -EAGAIN;
 			goto out;
 		}
-- 
2.29.2