[PATCH 6/6] vmtrunc: bug if page_mapped

[Hugh Dickins]

If unmap_mapping_range (and mapping->truncate_count) are doing their
jobs right, truncate_complete_page should never find the page mapped:
add BUG_ON for our immediate testing, but this patch should probably
not go to mainline - a mapped page here is not a catastrophe.

Unsigned-off-by: Hugh Dickins <hugh@xxxxxxxxxxx>
---

 mm/truncate.c |    1 +
 1 files changed, 1 insertion(+)

--- trunc5/mm/truncate.c	2004-10-02 18:22:29.000000000 +0100
+++ trunc6/mm/truncate.c	2004-10-03 16:37:39.677144808 +0100
@@ -45,6 +45,7 @@ static inline void truncate_partial_page
 static void
 truncate_complete_page(struct address_space *mapping, struct page *page)
 {
+	BUG_ON(page_mapped(page));
 	if (page->mapping != mapping)
 		return;
 

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