mm/rmap.c: use VM_BUG_ON_PAGE() in __page_check_anon_rmap()

The __page_check_anon_rmap() just calls two BUG_ON()s protected by
CONFIG_DEBUG_VM, the #ifdef could be eliminated by using VM_BUG_ON_PAGE().

Link: http://lkml.kernel.org/r/1573157346-111316-1-git-send-email-yang.shi@linux.alibaba.com
Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/rmap.c b/mm/rmap.c
index 0b00c20..72a3280 100644 (file)
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1075,7 +1075,6 @@ static void __page_set_anon_rmap(struct page *page,
 static void __page_check_anon_rmap(struct page *page,
        struct vm_area_struct *vma, unsigned long address)
 {
-#ifdef CONFIG_DEBUG_VM
        /*
         * The page's anon-rmap details (mapping and index) are guaranteed to
         * be set up correctly at this point.
@@ -1088,9 +1087,9 @@ static void __page_check_anon_rmap(struct page *page,
         * are initially only visible via the pagetables, and the pte is locked
         * over the call to page_add_new_anon_rmap.
         */
-       BUG_ON(page_anon_vma(page)->root != vma->anon_vma->root);
-       BUG_ON(page_to_pgoff(page) != linear_page_index(vma, address));
-#endif
+       VM_BUG_ON_PAGE(page_anon_vma(page)->root != vma->anon_vma->root, page);
+       VM_BUG_ON_PAGE(page_to_pgoff(page) != linear_page_index(vma, address),
+                      page);
 }
 
 /**