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mm/khugepaged: convert is_refcount_suitable() to use folios

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Both callers of is_refcount_suitable() have been converted to use
folios, so convert it to take in a folio. Both callers only operate on
head pages of folios so mapcount/refcount conversions here are trivial.

Removes 3 calls to compound head, and removes 315 bytes of kernel text.

Link: https://lkml.kernel.org/r/20231020183331.10770-4-vishal.moola@gmail.com
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Vishal Moola (Oracle) 2023-10-20 11:33:29 -07:00 committed by Andrew Morton
parent 5c07ebb372
commit dbf85c21e4
1 changed files with 7 additions and 7 deletions
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14
mm/khugepaged.c
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@ -524,15 +524,15 @@ static void release_pte_pages(pte_t *pte, pte_t *_pte,
}
}
static bool is_refcount_suitable(struct page *page)
static bool is_refcount_suitable(struct folio *folio)
{
int expected_refcount;
expected_refcount = total_mapcount(page);
if (PageSwapCache(page))
expected_refcount += compound_nr(page);
expected_refcount = folio_mapcount(folio);
if (folio_test_swapcache(folio))
expected_refcount += folio_nr_pages(folio);
return page_count(page) == expected_refcount;
return folio_ref_count(folio) == expected_refcount;
}
static int __collapse_huge_page_isolate(struct vm_area_struct *vma,
@ -625,7 +625,7 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma,
* but not from this process. The other process cannot write to
* the page, only trigger CoW.
*/
if (!is_refcount_suitable(&folio->page)) {
if (!is_refcount_suitable(folio)) {
folio_unlock(folio);
result = SCAN_PAGE_COUNT;
goto out;
@ -1371,7 +1371,7 @@ static int hpage_collapse_scan_pmd(struct mm_struct *mm,
* has excessive GUP pins (i.e. 512). Anyway the same check
* will be done again later the risk seems low.
*/
if (!is_refcount_suitable(&folio->page)) {
if (!is_refcount_suitable(folio)) {
result = SCAN_PAGE_COUNT;
goto out_unmap;
}