[PATCH] Document Linux's memory barriers [try #2]

[Linus Torvalds]

On Thu, 9 Mar 2006, Paul Mackerras wrote:
> 
> If you ask me, the need for mmiowb on some platforms merely shows that
> those platforms' implementations of spinlocks and read*/write* are
> buggy...

You could also state that same as

	"If you ask me, the need for mmiowb on some platforms merely shows 
	 that those platforms perform like a bat out of hell, and I think 
	 they should be slower"

because the fact is, x86 memory barrier rules are just about optimal for 
performance.

		Linus