Re: [PATCH 09/16] ps3disk: use memcpy_{from,to}_bvec

[Christoph Hellwig]

On Tue, Jun 08, 2021 at 06:48:22PM -0700, Ira Weiny wrote:
> I'm still not 100% sure that these flushes are needed but the are not no-ops on
> every arch.  Would it be best to preserve them after the memcpy_to/from_bvec()?
> 
> Same thing in patch 11 and 14.

To me it seems kunmap_local should basically always call the equivalent
of flush_kernel_dcache_page.  parisc does this through
kunmap_flush_on_unmap, but none of the other architectures with VIVT
caches or other coherency issues does.

Does anyone have a history or other insights here?