mm,thp: add read-only THP support for (non-shmem) FS

[platform/kernel/linux-starfive.git] / mm / rmap.c

diff --git a/mm/rmap.c b/mm/rmap.c
index 2600644..d9a23bb 100644 (file)
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1189,8 +1189,10 @@ void page_add_file_rmap(struct page *page, bool compound)
                }
                if (!atomic_inc_and_test(compound_mapcount_ptr(page)))
                        goto out;
-               VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
-               __inc_node_page_state(page, NR_SHMEM_PMDMAPPED);
+               if (PageSwapBacked(page))
+                       __inc_node_page_state(page, NR_SHMEM_PMDMAPPED);
+               else
+                       __inc_node_page_state(page, NR_FILE_PMDMAPPED);
        } else {
                if (PageTransCompound(page) && page_mapping(page)) {
                        VM_WARN_ON_ONCE(!PageLocked(page));
@@ -1229,8 +1231,10 @@ static void page_remove_file_rmap(struct page *page, bool compound)
                }
                if (!atomic_add_negative(-1, compound_mapcount_ptr(page)))
                        goto out;
-               VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
-               __dec_node_page_state(page, NR_SHMEM_PMDMAPPED);
+               if (PageSwapBacked(page))
+                       __dec_node_page_state(page, NR_SHMEM_PMDMAPPED);
+               else
+                       __dec_node_page_state(page, NR_FILE_PMDMAPPED);
        } else {
                if (!atomic_add_negative(-1, &page->_mapcount))
                        goto out;