mm: fix the page_swap_info() BUG_ON check

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

diff --git a/mm/page_io.c b/mm/page_io.c
index 16bd82f..eafe5dd 100644 (file)
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -264,6 +264,7 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
        int ret;
        struct swap_info_struct *sis = page_swap_info(page);
 
+       BUG_ON(!PageSwapCache(page));
        if (sis->flags & SWP_FILE) {
                struct kiocb kiocb;
                struct file *swap_file = sis->swap_file;
@@ -337,6 +338,7 @@ int swap_readpage(struct page *page)
        int ret = 0;
        struct swap_info_struct *sis = page_swap_info(page);
 
+       BUG_ON(!PageSwapCache(page));
        VM_BUG_ON_PAGE(!PageLocked(page), page);
        VM_BUG_ON_PAGE(PageUptodate(page), page);
        if (frontswap_load(page) == 0) {
@@ -386,6 +388,7 @@ int swap_set_page_dirty(struct page *page)
 
        if (sis->flags & SWP_FILE) {
                struct address_space *mapping = sis->swap_file->f_mapping;
+               BUG_ON(!PageSwapCache(page));
                return mapping->a_ops->set_page_dirty(page);
        } else {
                return __set_page_dirty_no_writeback(page);