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

Paul Mackerras paulus at cs.anu.edu.au
Thu Aug 12 17:11:49 EST 1999

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?


[[ This message was sent via the linuxppc-dev mailing list.  Replies are ]]
[[ not  forced  back  to the list, so be sure to Cc linuxppc-dev if your ]]
[[ reply is of general interest. Please check http://lists.linuxppc.org/ ]]
[[ and http://www.linuxppc.org/ for useful information before posting.   ]]

More information about the Linuxppc-dev mailing list