From: David Hildenbrand david@redhat.com
mainline inclusion from mainline-v6.8-rc1 commit b832a354d787bfbdea5c226f0d77cc1a222d09f8 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I9CESE CVE: NA
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Let's convert restore_exclusive_pte() and do_swap_page(). While at it, perform some folio conversion in restore_exclusive_pte().
Link: https://lkml.kernel.org/r/20231220224504.646757-21-david@redhat.com Signed-off-by: David Hildenbrand david@redhat.com Cc: Hugh Dickins hughd@google.com Cc: Matthew Wilcox (Oracle) willy@infradead.org Cc: Muchun Song muchun.song@linux.dev Cc: Muchun Song songmuchun@bytedance.com Cc: Peter Xu peterx@redhat.com Cc: Ryan Roberts ryan.roberts@arm.com Cc: Yin Fengwei fengwei.yin@intel.com Signed-off-by: Andrew Morton akpm@linux-foundation.org (cherry picked from commit b832a354d787bfbdea5c226f0d77cc1a222d09f8) Signed-off-by: Kefeng Wang wangkefeng.wang@huawei.com --- mm/memory.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/mm/memory.c b/mm/memory.c index 5b8214c729bc..54fc81a39772 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -713,6 +713,7 @@ static void restore_exclusive_pte(struct vm_area_struct *vma, struct page *page, unsigned long address, pte_t *ptep) { + struct folio *folio = page_folio(page); pte_t orig_pte; pte_t pte; swp_entry_t entry; @@ -728,14 +729,15 @@ static void restore_exclusive_pte(struct vm_area_struct *vma, else if (is_writable_device_exclusive_entry(entry)) pte = maybe_mkwrite(pte_mkdirty(pte), vma);
- VM_BUG_ON(pte_write(pte) && !(PageAnon(page) && PageAnonExclusive(page))); + VM_BUG_ON_FOLIO(pte_write(pte) && (!folio_test_anon(folio) && + PageAnonExclusive(page)), folio);
/* * No need to take a page reference as one was already * created when the swap entry was made. */ - if (PageAnon(page)) - page_add_anon_rmap(page, vma, address, RMAP_NONE); + if (folio_test_anon(folio)) + folio_add_anon_rmap_pte(folio, page, vma, address, RMAP_NONE); else /* * Currently device exclusive access only supports anonymous @@ -4085,7 +4087,8 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) page_add_new_anon_rmap(page, vma, vmf->address); folio_add_lru_vma(folio, vma); } else { - page_add_anon_rmap(page, vma, vmf->address, rmap_flags); + folio_add_anon_rmap_pte(folio, page, vma, vmf->address, + rmap_flags); }
VM_BUG_ON(!folio_test_anon(folio) ||