On Tue, 13 Dec 2005 08:20:27 -0800,
"Paul E. McKenney" <[email protected]> wrote:
>If the variable p references MMIO rather than normal memory, then
>wmb() and rmb() are needed instead of smp_wmb() and smp_rmb().
mmiowb(), not wmb(). IA64 has a different form of memory fence for I/O
space compared to normal memory. MIPS also has a non-empty form of
mmiowb().
>This is because the I/O device needs to see the accesses ordered
>even in a UP system.
Why does mmiowb() map to empty on most systems, including Alpha?
Should it not map to wmb() for everything except IA64 and MIPS?
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