Re: [PATCH V7 1/2] csky/dma: bugfix dma_sync_for_cpu/device

[Arnd Bergmann]

On Tue, Sep 18, 2018 at 3:48 PM Guo Ren <ren_guo@xxxxxxxxx> wrote:
>
> ref: https://lkml.org/lkml/2018/5/18/1068
>
>         map             for_cpu         for_device      unmap
> TO_DEV  writeback       none            writeback       none
> TO_CPU  invalidate      invalidate*     invalidate      invalidate*
> BIDIR   writeback       invalidate      writeback       invalidate
>
> Signed-off-by: Guo Ren <ren_guo@xxxxxxxxx>

Same comment as for the other patch: Explain why the original
version is wrong first. When giving a reference to some other
discussion, use the "Link" tag above your Signed-off-by line.
To point to a discussion on lkml, lore.kernel.org is the
recommended archive, so it would become

Link: https://lore.kernel.org/lkml/20180518215548.GH17671@xxxxxxxxxxxxxxxxxxxxx/

       Arnd