[PATCH 4/7] mm/hugetlb: add hugetlb_set_folio_subpool() helper

From: Sidhartha Kumar
Date: Mon Aug 29 2022 - 19:01:40 EST


allows hugetlb subpool information to be set through a folio.

Signed-off-by: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
---
fs/hugetlbfs/inode.c | 4 ++--
include/linux/hugetlb.h | 8 +++++++-
2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index d1a6384f426e..3b5c941e49a7 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -971,9 +971,9 @@ static int hugetlbfs_migrate_folio(struct address_space *mapping,
return rc;

if (hugetlb_folio_subpool(src)) {
- hugetlb_set_page_subpool(&dst->page,
+ hugetlb_set_folio_subpool(dst,
hugetlb_folio_subpool(src));
- hugetlb_set_page_subpool(&src->page, NULL);
+ hugetlb_set_folio_subpool(src, NULL);
}

if (mode != MIGRATE_SYNC_NO_COPY)
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index f6d5467c5ed8..d8742c5bf454 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -722,10 +722,16 @@ static inline struct hugepage_subpool *hugetlb_page_subpool(struct page *hpage)
return hugetlb_folio_subpool(page_folio(hpage));
}

+static inline void hugetlb_set_folio_subpool(struct folio *folio,
+ struct hugepage_subpool *subpool)
+{
+ folio_set_private_1(folio, (unsigned long)subpool);
+}
+
static inline void hugetlb_set_page_subpool(struct page *hpage,
struct hugepage_subpool *subpool)
{
- set_page_private(hpage + SUBPAGE_INDEX_SUBPOOL, (unsigned long)subpool);
+ hugetlb_set_folio_subpool(page_folio(hpage), subpool);
}

static inline struct hstate *hstate_file(struct file *f)
--
2.31.1