shmem: add huge pages support

[cascardo/linux.git] / mm / filemap.c

diff --git a/mm/filemap.c b/mm/filemap.c
index 21508ea..e90c154 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -219,8 +219,13 @@ void __delete_from_page_cache(struct page *page, void *shadow)
        /* hugetlb pages do not participate in page cache accounting. */
        if (!PageHuge(page))
                __mod_zone_page_state(page_zone(page), NR_FILE_PAGES, -nr);
-       if (PageSwapBacked(page))
+       if (PageSwapBacked(page)) {
                __mod_zone_page_state(page_zone(page), NR_SHMEM, -nr);
+               if (PageTransHuge(page))
+                       __dec_zone_page_state(page, NR_SHMEM_THPS);
+       } else {
+               VM_BUG_ON_PAGE(PageTransHuge(page) && !PageHuge(page), page);
+       }
 
        /*
         * At this point page must be either written or cleaned by truncate.