Re: [patch] spinlocks: remove 'volatile'

[Nick Piggin]

linux-os (Dick Johnson) wrote:

>  	http://en.wikipedia.org/wiki/Memory_barrier
>
> This is used to prevent out-of-order execution, not at all what is
> necessary.

I don't think memory barriers prevent out of order execution,
just out of order loads and stores (which could happen on CPUs
that do in-order execution).

--
SUSE Labs, Novell Inc.
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