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mm: convert collapse_huge_page() to use a folio 

Replace three calls to compound_head() with one.

Link: https://lkml.kernel.org/r/20231211162214.2146080-9-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-12-11 16:22:13 +00:00 committed by Andrew Morton
parent d3b0827365
commit 5432726848
1 changed files with 8 additions and 7 deletions
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15
mm/khugepaged.c
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@ -1090,6 +1090,7 @@ static int collapse_huge_page(struct mm_struct *mm, unsigned long address,
pmd_t *pmd, _pmd;
pte_t *pte;
pgtable_t pgtable;
struct folio *folio;
struct page *hpage;
spinlock_t *pmd_ptl, *pte_ptl;
int result = SCAN_FAIL;
@ -1212,13 +1213,13 @@ static int collapse_huge_page(struct mm_struct *mm, unsigned long address,
if (unlikely(result != SCAN_SUCCEED))
goto out_up_write;
folio = page_folio(hpage);
/*
* spin_lock() below is not the equivalent of smp_wmb(), but
* the smp_wmb() inside __SetPageUptodate() can be reused to
* avoid the copy_huge_page writes to become visible after
* the set_pmd_at() write.
* The smp_wmb() inside __folio_mark_uptodate() ensures the
* copy_huge_page writes become visible before the set_pmd_at()
* write.
*/
__SetPageUptodate(hpage);
__folio_mark_uptodate(folio);
pgtable = pmd_pgtable(_pmd);
_pmd = mk_huge_pmd(hpage, vma->vm_page_prot);
@ -1226,8 +1227,8 @@ static int collapse_huge_page(struct mm_struct *mm, unsigned long address,
spin_lock(pmd_ptl);
BUG_ON(!pmd_none(*pmd));
page_add_new_anon_rmap(hpage, vma, address);
lru_cache_add_inactive_or_unevictable(hpage, vma);
folio_add_new_anon_rmap(folio, vma, address);
folio_add_lru_vma(folio, vma);
pgtable_trans_huge_deposit(mm, pmd, pgtable);
set_pmd_at(mm, address, pmd, _pmd);
update_mmu_cache_pmd(vma, address, pmd);