check_pte is called for hugetlbfs page and comparing pfn in pfn_in_page,
where pfn is compared in range [hpage_pfn, hpage_pfn+HPAGE_PMD_NR). For
hugetlbfs page, pfn must equal to hpage_pfn, so catch it as bug if they
are not equal.
Signed-off-by: Li Xinhai <lixinhai.lxh@xxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
mm/page_vma_mapped.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c
index eff4b45..713aaed 100644
--- a/mm/page_vma_mapped.c
+++ b/mm/page_vma_mapped.c
@@ -55,6 +55,7 @@ static bool map_pte(struct page_vma_mapped_walk *pvmw)
static inline bool pfn_in_hpage(struct page *hpage, unsigned long pfn)
{
unsigned long hpage_pfn = page_to_pfn(hpage);
+ VM_BUG_ON_PAGE(PageHuge(hpage) && pfn != hpage_pfn, hpage);
/* THP can be referenced by any subpage */
return pfn >= hpage_pfn && pfn - hpage_pfn < hpage_nr_pages(hpage);
--
1.8.3.1
