Commit ef2bf0dc authored by Dave Jones's avatar Dave Jones Committed by Linus Torvalds
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[PATCH] rmap: additional diagnostics in page_remove_rmap()

We seem to be hitting this assertion failure too often for it to be
hardware bugs.

Cc: Hugh Dickins <>
Cc: Nick Piggin <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent cd105df4
......@@ -514,6 +514,13 @@ void page_add_file_rmap(struct page *page)
void page_remove_rmap(struct page *page)
if (atomic_add_negative(-1, &page->_mapcount)) {
if (page_mapcount(page) < 0) {
printk (KERN_EMERG "Eeek! page_mapcount(page) went negative! (%d)\n", page_mapcount(page));
printk (KERN_EMERG " page->flags = %lx\n", page->flags);
printk (KERN_EMERG " page->count = %x\n", page_count(page));
printk (KERN_EMERG " page->mapping = %p\n", page->mapping);
BUG_ON(page_mapcount(page) < 0);
* It would be tidy to reset the PageAnon mapping here,
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