mm/page_io.c: replace some BUG_ON()s with VM_BUG_ON_PAGE()

So they are CONFIG_DEBUG_VM-only and more informative.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: David S. Miller <davem@davemloft.net>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Joe Perches <joe@perches.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Rik van Riel <riel@redhat.com>
Cc: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 3 deletions

diff --git a/mm/page_io.c b/mm/page_io.c
index eafe5ddc2b54..a2651f58c86a 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -264,7 +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));
+        VM_BUG_ON_PAGE(!PageSwapCache(page), page);
         if (sis->flags & SWP_FILE) {
                 struct kiocb kiocb;
                 struct file *swap_file = sis->swap_file;
@@ -338,7 +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(!PageSwapCache(page), page);
         VM_BUG_ON_PAGE(!PageLocked(page), page);
         VM_BUG_ON_PAGE(PageUptodate(page), page);
         if (frontswap_load(page) == 0) {
@@ -388,7 +388,8 @@ 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));
+
+                VM_BUG_ON_PAGE(!PageSwapCache(page), page);
                 return mapping->a_ops->set_page_dirty(page);
         } else {
                 return __set_page_dirty_no_writeback(page);