About the coherence of the D-cache

I am accessing user-space memory from the network bottom-half using
ASI_PHYS_USE_EC. I copied quite a bit from arch/sparc64/kernel/ptrace.c and
everything looks fine. 

Nevertheless I want to be sure that when I write data no stalled data is left on
the D-cache.

In the normal use of ptrace functions, I think there isn't data from in traced
process on the primary cache so there is no problem. But in my case, it is very
possible that the data I am reading/writing is there. I whould even want to
read/write it directly...

So which is the opinion of the master hackers?


Marc