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0e1f616
(Get the code!)
From what doko says indeed on non-Ubuntu (and thus non Linaro) gcc 4.5 does not generate the more optimal code.
In general I was confused by the fact that this is not natty specific. I was thinking lucid/maverick etc have their own packaging branches and the natty package does not carry legacy stuff.
In either case the missing dmb instruction makes this not SMP safe. I think the asm patches were originally written before there were SMP ARM boards available making it a non-issue back then.