[linux-fbdev] Re: readl() and friends and eieio on PPC

[Paul Mackerras]

Richard Henderson <rth at cygnus.com> wrote:

> I prefer high-performance drivers. 

Sure, so do I.  But when I can get safety as well, for the cost of one
extra cpu cycle per device access, which can probably be overlapped
with the device access anyway, I think it's a good deal.

On alpha, does wmb() stop a subsequent load from being moved ahead of
a previous store?  Or do you have to use mb() to get that effect?

Paul.

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