This is a note to let you know that I've just added the patch titled
mm/hugetlb: add hugetlb_folio_subpool() helpers
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-hugetlb-add-hugetlb_folio_subpool-helpers.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b63950dc421fb0ba0d198e754ded83610eb96da9
Author: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Date: Thu Sep 22 10:42:05 2022 -0500
mm/hugetlb: add hugetlb_folio_subpool() helpers
[ Upstream commit 149562f7509404c382c32c3fa8a6ba356135e5cf ]
Allow hugetlbfs_migrate_folio to check and read subpool information by
passing in a folio.
Link: https://lkml.kernel.org/r/20220922154207.1575343-4-sidhartha.kumar@xxxxxxxxxx
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Colin Cross <ccross@xxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: "Eric W . Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: kernel test robot <lkp@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: William Kucharski <william.kucharski@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Stable-dep-of: b76b46902c2d ("mm/hugetlb: fix missing hugetlb_lock for resv uncharge")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 4fe4b3393e71c..330729445d8ab 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -1108,10 +1108,10 @@ static int hugetlbfs_migrate_folio(struct address_space *mapping,
if (rc != MIGRATEPAGE_SUCCESS)
return rc;
- if (hugetlb_page_subpool(&src->page)) {
- hugetlb_set_page_subpool(&dst->page,
- hugetlb_page_subpool(&src->page));
- hugetlb_set_page_subpool(&src->page, NULL);
+ if (hugetlb_folio_subpool(src)) {
+ hugetlb_set_folio_subpool(dst,
+ hugetlb_folio_subpool(src));
+ 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 0c5326fd3c47a..02d9a8af3704e 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -754,18 +754,29 @@ extern unsigned int default_hstate_idx;
#define default_hstate (hstates[default_hstate_idx])
+static inline struct hugepage_subpool *hugetlb_folio_subpool(struct folio *folio)
+{
+ return (void *)folio_get_private_1(folio);
+}
+
/*
* hugetlb page subpool pointer located in hpage[1].private
*/
static inline struct hugepage_subpool *hugetlb_page_subpool(struct page *hpage)
{
- return (void *)page_private(hpage + SUBPAGE_INDEX_SUBPOOL);
+ 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)
