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From:   js1304@gmail.com
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        kernel-team@lge.com, Vlastimil Babka <vbabka@suse.cz>,
        Christoph Hellwig <hch@infradead.org>,
        Roman Gushchin <guro@fb.com>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
        Michal Hocko <mhocko@suse.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>
Subject: [PATCH v2 05/12] mm/hugetlb: unify hugetlb migration callback function
Date:   Wed, 27 May 2020 15:44:56 +0900
Message-Id: <1590561903-13186-6-git-send-email-iamjoonsoo.kim@lge.com>
In-Reply-To: <1590561903-13186-1-git-send-email-iamjoonsoo.kim@lge.com>
References: <1590561903-13186-1-git-send-email-iamjoonsoo.kim@lge.com>
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From: Joonsoo Kim <iamjoonsoo.kim@lge.com>

There is no difference between two migration callback functions,
alloc_huge_page_node() and alloc_huge_page_nodemask(), except
__GFP_THISNODE handling. This patch moves this handling to
alloc_huge_page_nodemask() and function caller. Then, remove
alloc_huge_page_node().

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
---
 include/linux/hugetlb.h |  8 --------
 mm/hugetlb.c            | 23 ++---------------------
 mm/mempolicy.c          |  3 ++-
 3 files changed, 4 insertions(+), 30 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 15c8fb8..f482563 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -505,8 +505,6 @@ struct huge_bootmem_page {
 
 struct page *alloc_migrate_huge_page(struct hstate *h,
 				struct alloc_control *ac);
-struct page *alloc_huge_page_node(struct hstate *h,
-				struct alloc_control *ac);
 struct page *alloc_huge_page_nodemask(struct hstate *h,
 				struct alloc_control *ac);
 struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
@@ -755,12 +753,6 @@ static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
 struct hstate {};
 
 static inline struct page *
-alloc_huge_page_node(struct hstate *h, struct alloc_control *ac)
-{
-	return NULL;
-}
-
-static inline struct page *
 alloc_huge_page_nodemask(struct hstate *h, struct alloc_control *ac)
 {
 	return NULL;
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index dabe460..8132985 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1980,31 +1980,12 @@ struct page *alloc_buddy_huge_page_with_mpol(struct hstate *h,
 }
 
 /* page migration callback function */
-struct page *alloc_huge_page_node(struct hstate *h,
-				struct alloc_control *ac)
-{
-	struct page *page = NULL;
-
-	ac->gfp_mask |= htlb_alloc_mask(h);
-	if (ac->nid != NUMA_NO_NODE)
-		ac->gfp_mask |= __GFP_THISNODE;
-
-	spin_lock(&hugetlb_lock);
-	if (h->free_huge_pages - h->resv_huge_pages > 0)
-		page = dequeue_huge_page_nodemask(h, ac);
-	spin_unlock(&hugetlb_lock);
-
-	if (!page)
-		page = alloc_migrate_huge_page(h, ac);
-
-	return page;
-}
-
-/* page migration callback function */
 struct page *alloc_huge_page_nodemask(struct hstate *h,
 				struct alloc_control *ac)
 {
 	ac->gfp_mask |= htlb_alloc_mask(h);
+	if (ac->nid == NUMA_NO_NODE)
+		ac->gfp_mask &= ~__GFP_THISNODE;
 
 	spin_lock(&hugetlb_lock);
 	if (h->free_huge_pages - h->resv_huge_pages > 0) {
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 3b6b551..e705efd 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1073,9 +1073,10 @@ struct page *alloc_new_node_page(struct page *page, unsigned long node)
 		struct alloc_control ac = {
 			.nid = node,
 			.nmask = NULL,
+			.gfp_mask = __GFP_THISNODE,
 		};
 
-		return alloc_huge_page_node(h, &ac);
+		return alloc_huge_page_nodemask(h, &ac);
 	} else if (PageTransHuge(page)) {
 		struct page *thp;
 
-- 
2.7.4