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* [patch 043/158] mm/rmap.c: use VM_BUG_ON_PAGE() in __page_check_anon_rmap()
@ 2019-12-01  1:51 akpm
  0 siblings, 0 replies; only message in thread
From: akpm @ 2019-12-01  1:51 UTC (permalink / raw)
  To: akpm, kirill.shutemov, linux-mm, mm-commits, torvalds, yang.shi

From: Yang Shi <yang.shi@linux.alibaba.com>
Subject: 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>
---

 mm/rmap.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/mm/rmap.c~mm-rmap-use-vm_bug_on_page-in-__page_check_anon_rmap
+++ a/mm/rmap.c
@@ -1075,7 +1075,6 @@ static void __page_set_anon_rmap(struct
 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(struc
 	 * 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);
 }
 
 /**
_


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2019-12-01  1:51 [patch 043/158] mm/rmap.c: use VM_BUG_ON_PAGE() in __page_check_anon_rmap() akpm

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