From: "Vishal Moola (Oracle)" vishal.moola@gmail.com
mainline inclusion from mainline-6.7-rc1 commit dbf85c21e4aff90912b5d7755d2b25611f9191e9 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I9CESE CVE: NA
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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 (cherry picked from commit dbf85c21e4aff90912b5d7755d2b25611f9191e9) Signed-off-by: Kefeng Wang wangkefeng.wang@huawei.com --- mm/khugepaged.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 0e456ca09690..06cab9f68d55 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -532,15 +532,15 @@ 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, @@ -633,7 +633,7 @@ 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; @@ -1391,7 +1391,7 @@ 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; }