Hi Koichiro-san,

> actually fine, but in any case, I personally feel the unmap infrastructure could
> use some cleanup.)

I share this thought, and I guess, Laurent expressed this, too. This is
a separate task to tackle, though. I still think your original patch
here makes the situation better by making sure the cache gets
invalidated and should be applied. Or am I missing something?

Happy hacking,

   Wolfram