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mm/hugetlb: add hugetlb_folio_subpool() helpers

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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@oracle.com
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Colin Cross <ccross@google.com>
Cc: David Howells <dhowells@redhat.com>
Cc: "Eric W . Biederman" <ebiederm@xmission.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: William Kucharski <william.kucharski@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Sidhartha Kumar 2022-09-22 10:42:05 -05:00 committed by Andrew Morton
parent d340625f48
commit 149562f750
2 changed files with 17 additions and 6 deletions
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8
fs/hugetlbfs/inode.c
View File

@ -1091,10 +1091,10 @@ 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)

15
include/linux/hugetlb.h
View File

@ -718,18 +718,29 @@ 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)