[PATCH] move rmap BUG_ON outside DEBUG_VM
We have a persistent dribble of reports of this BUG triggering. Its extended diagnostics were recently made conditional on CONFIG_DEBUG_VM, which was a bad idea - we want to know about it. Signed-off-by: Dave Jones <davej@redhat.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -576,15 +576,14 @@ void page_add_file_rmap(struct page *page)
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void page_remove_rmap(struct page *page)
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{
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if (atomic_add_negative(-1, &page->_mapcount)) {
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#ifdef CONFIG_DEBUG_VM
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if (unlikely(page_mapcount(page) < 0)) {
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printk (KERN_EMERG "Eeek! page_mapcount(page) went negative! (%d)\n", page_mapcount(page));
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printk (KERN_EMERG " page->flags = %lx\n", page->flags);
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printk (KERN_EMERG " page->count = %x\n", page_count(page));
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printk (KERN_EMERG " page->mapping = %p\n", page->mapping);
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BUG();
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}
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#endif
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BUG_ON(page_mapcount(page) < 0);
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/*
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* It would be tidy to reset the PageAnon mapping here,
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* but that might overwrite a racing page_add_anon_rmap
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