This function is, for now, a placeholder; it will be used in future to determine whether to use the virtual page index or not, based on whether the folio is anonymous or not.
Currently it simply wraps linear_page_index(), so this does not change behaviour. We update callers that will, once the change is introduced to track anonymous folios by virtual page offset if MAP_PRIVATE file-backed, need to determine which index to use based on folio type. No functional change intended. Signed-off-by: Lorenzo Stoakes (ARM) <[email protected]> --- include/linux/pagemap.h | 18 ++++++++++++++++++ mm/huge_memory.c | 3 ++- mm/migrate.c | 6 ++++-- mm/userfaultfd.c | 6 ++++-- 4 files changed, 28 insertions(+), 5 deletions(-) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 81da91e103b3..dab355eda0ef 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -1142,6 +1142,24 @@ static inline pgoff_t linear_virt_page_index(const struct vm_area_struct *vma, return pgoff; } +/** + * linear_folio_page_index() - Determine the absolute page offset of + * @address within @vma from @folio. + * @folio: The folio whose linear page index is sought. + * @vma: The VMA in which @address resides. + * @address: The address whose absolute page offset is required. + * + * For compatibility, currently identical to linear_page_index(). + * + * Returns: The absolute page offset of @address within @vma. + */ +static inline pgoff_t linear_folio_page_index(const struct folio *folio, + const struct vm_area_struct *vma, + const unsigned long address) +{ + return linear_page_index(vma, address); +} + struct wait_page_key { struct folio *folio; int bit_nr; diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 9b1f3b24f7e0..abc65d608c23 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2887,7 +2887,8 @@ int move_pages_huge_pmd(struct mm_struct *mm, pmd_t *dst_pmd, pmd_t *src_pmd, pm } folio_move_anon_rmap(src_folio, dst_vma); - src_folio->index = linear_page_index(dst_vma, dst_addr); + src_folio->index = linear_folio_page_index(src_folio, dst_vma, + dst_addr); _dst_pmd = folio_mk_pmd(src_folio, dst_vma->vm_page_prot); /* Follow mremap() behavior and treat the entry dirty after the move */ diff --git a/mm/migrate.c b/mm/migrate.c index 222c8c15f782..37fe7a9b3fac 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -363,8 +363,10 @@ static bool remove_migration_pte(struct folio *folio, unsigned long idx = 0; /* pgoff is invalid for ksm pages, but they are never large */ - if (folio_test_large(folio) && !folio_test_hugetlb(folio)) - idx = linear_page_index(vma, pvmw.address) - pvmw.pgoff; + if (folio_test_large(folio) && !folio_test_hugetlb(folio)) { + idx += linear_folio_page_index(folio, vma, pvmw.address); + idx -= pvmw.pgoff; + } new = folio_page(folio, idx); #ifdef CONFIG_ARCH_HAS_PMD_SOFTLEAVES diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c index 8fd24c8b428e..258b03182a78 100644 --- a/mm/userfaultfd.c +++ b/mm/userfaultfd.c @@ -1352,7 +1352,8 @@ static long move_present_ptes(struct mm_struct *mm, } folio_move_anon_rmap(src_folio, dst_vma); - src_folio->index = linear_page_index(dst_vma, dst_addr); + src_folio->index = linear_folio_page_index(src_folio, dst_vma, + dst_addr); orig_dst_pte = folio_mk_pte(src_folio, dst_vma->vm_page_prot); /* Set soft dirty bit so userspace can notice the pte was moved */ @@ -1428,7 +1429,8 @@ static int move_swap_pte(struct mm_struct *mm, struct vm_area_struct *dst_vma, */ if (src_folio) { folio_move_anon_rmap(src_folio, dst_vma); - src_folio->index = linear_page_index(dst_vma, dst_addr); + src_folio->index = linear_folio_page_index(src_folio, dst_vma, + dst_addr); } else { /* * Check if the swap entry is cached after acquiring the src_pte -- 2.55.0
