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mm/hugetlb: convert restore_reserve_on_error() to folios

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Use the hugetlb folio flag macros inside restore_reserve_on_error() and
update the comments to reflect the use of folios.

Link: https://lkml.kernel.org/r/20230113223057.173292-8-sidhartha.kumar@oracle.com
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Sidhartha Kumar 2023-01-13 16:30:56 -06:00 committed by Andrew Morton
parent e37d3e838d
commit 0ffdc38eb5
1 changed files with 14 additions and 13 deletions
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27
mm/hugetlb.c
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@ -2819,22 +2819,23 @@ static long vma_del_reservation(struct hstate *h,
void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
unsigned long address, struct page *page)
{
struct folio *folio = page_folio(page);
long rc = vma_needs_reservation(h, vma, address);
if (HPageRestoreReserve(page)) {
if (folio_test_hugetlb_restore_reserve(folio)) {
if (unlikely(rc < 0))
/*
* Rare out of memory condition in reserve map
* manipulation. Clear HPageRestoreReserve so that
* global reserve count will not be incremented
* manipulation. Clear hugetlb_restore_reserve so
* that global reserve count will not be incremented
* by free_huge_page. This will make it appear
* as though the reservation for this page was
* as though the reservation for this folio was
* consumed. This may prevent the task from
* faulting in the page at a later time. This
* faulting in the folio at a later time. This
* is better than inconsistent global huge page
* accounting of reserve counts.
*/
ClearHPageRestoreReserve(page);
folio_clear_hugetlb_restore_reserve(folio);
else if (rc)
(void)vma_add_reservation(h, vma, address);
else
@ -2845,7 +2846,7 @@ void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
* This indicates there is an entry in the reserve map
* not added by alloc_huge_page. We know it was added
* before the alloc_huge_page call, otherwise
* HPageRestoreReserve would be set on the page.
* hugetlb_restore_reserve would be set on the folio.
* Remove the entry so that a subsequent allocation
* does not consume a reservation.
*/
@ -2854,12 +2855,12 @@ void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
/*
* VERY rare out of memory condition. Since
* we can not delete the entry, set
* HPageRestoreReserve so that the reserve
* count will be incremented when the page
* hugetlb_restore_reserve so that the reserve
* count will be incremented when the folio
* is freed. This reserve will be consumed
* on a subsequent allocation.
*/
SetHPageRestoreReserve(page);
folio_set_hugetlb_restore_reserve(folio);
} else if (rc < 0) {
/*
* Rare out of memory condition from
@ -2875,12 +2876,12 @@ void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
/*
* For private mappings, no entry indicates
* a reservation is present. Since we can
* not add an entry, set SetHPageRestoreReserve
* on the page so reserve count will be
* not add an entry, set hugetlb_restore_reserve
* on the folio so reserve count will be
* incremented when freed. This reserve will
* be consumed on a subsequent allocation.
*/
SetHPageRestoreReserve(page);
folio_set_hugetlb_restore_reserve(folio);
} else
/*
* No reservation present, do nothing