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SubjectRe: remove mixture of non-atomic operations with page->flags which requires atomic operations to access
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   From: William Lee Irwin III <wli@holomorphy.com>
Date: Mon, 3 Jun 2002 04:00:55 -0700

if (PageWriteback(page))
BUG();
- ClearPageDirty(page);
- page->flags &= ~(1<<PG_referenced);
+
+ page->flags &= ~((1UL << PG_referenced) | (1UL << PG_dirty));
Umm, nevermind. Look at ClearPageDirty, it does
"other stuff" so you can't remove it wholesale.

In the end, the code is as it should be right now.
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