An excellent whitepaper titled Memory Barriers: a Hardware View for Software Hackers, discusses the effects of weakly ordered memory and the mechanisms put in place to deal with its pitfalls. This whitepaper is available publicly at:
This link is obtained using a general search engine for the Internet and using the search phrase "paul mckenney memory barriers".
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2014/06/24 Reworked external link.
2013/05/08 Automated cleanup pass.