As I said in a previous e-mail, it's the sync operation that does an
invalidate and this would affect the data in the buffer. Hence the patch
to make the invalidate operation non-destructive (as long as your CPU
doesn't do speculative loads into the D-cache or they can be disabled).

[Ronen Shitrit] What about I-cache prefetch? Unified cache?

The "sync_for_cpu" operation (from device case) first invalidates the L2
cache and then invalidates the L1 using a LDR/STR pair and cache op.
[Ronen Shitrit] So for v6-MP, if no D-cache spec pref, why do you need to inv the L1 at all?



-- 
Catalin