mips_user_cacheflush
int mips_user_cacheflush(struct proc *, vaddr_t, size_t, int);
error = mips_user_cacheflush(p, cfua.va, cfua.nbytes,
error = mips_user_cacheflush(p, cfua.va, cfua.nbytes,
return mips_user_cacheflush(p, va, nbytes, whichcache);