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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 <hugh@veritas.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent cd105df4

mm/rmap.c

+7 −0
Original line number Diff line number Diff line
@@ -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,