Process identical patches in different tree

[CK Hu]

Hi, Matthias:

On Wed, 2020-01-08 at 13:05 +0100, Matthias Brugger wrote:
> On 08/01/2020 12:14, Matthias Brugger wrote:
> > Hi CK,
> > 
> > On 07/01/2020 03:56, CK Hu wrote:
> >> Hi, Dave, Daniel, Matthias:
> >>
> >> In mediatek-drm-next-5.6 [1], I've cherry-pick 3 patches from
> >> v5.5-next/soc [2] because some drm patches depend on these cmdq patches.
> >> So these cmdq patches exist in both tree now. I want to know how to
> >> process this case. I think we could choose one of below way:
> >>
> >> 1. Because these cmdq patches are identical in both tree, so each tree
> >> could do its own upstream and the there would be nothing happen when
> >> merge.
> >> 2. Let soc upstream first, and mediatek drm rebase on the latest
> >> mainline then upstream.
> >>
> >> Which one do you prefer?
> >>
> > 
> > What we would need is a stable branch with this commits that get merged by both
> > trees. If I understand correctly that otherwise the SHA of the commits would be
> > different and that would provoke merge conflicts.
> > 
> > We should not rely on one tree being merged before the other. AFAIK there is no
> > hard merge order between trees.
> > 
> 
> I prepared a branch with the patches I think are relevant for you. Please
> confirm that this is correct, merge the tree in yours and I'll do the same for
> v5.5-next/soc
> 
> <paste>
> 
> The following changes since commit e42617b825f8073569da76dc4510bfa019b1c35a:
> 
>   Linux 5.5-rc1 (2019-12-08 14:57:55 -0800)
> 
> are available in the Git repository at:
> 
>   https://git.kernel.org/pub/scm/linux/kernel/git/matthias.bgg/linux.git/
> tags/v5.5-next-cmdq-stable
> 
> for you to fetch changes up to d412f18c9bc791d8951e903de9a68817e3098a6a:
> 
>   soc: mediatek: cmdq: add cmdq_dev_get_client_reg function (2020-01-08 12:59:57
> +0100)
> 
> ----------------------------------------------------------------
> cmdq patches needed by drm driver to use cmdq interface
> 
> ----------------------------------------------------------------
> Bibby Hsieh (4):
>       soc: mediatek: cmdq: remove OR opertaion from err return
>       soc: mediatek: cmdq: define the instruction struct
>       soc: mediatek: cmdq: add polling function
>       soc: mediatek: cmdq: add cmdq_dev_get_client_reg function
> 
>  drivers/soc/mediatek/mtk-cmdq-helper.c   | 147
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------------
>  include/linux/mailbox/mtk-cmdq-mailbox.h |  11 ++++++
>  include/linux/soc/mediatek/mtk-cmdq.h    |  53 +++++++++++++++++++++++++
>  3 files changed, 185 insertions(+), 26 deletions(-)
> 
> </paste>
> 

I've done in [1], is it what you expect?

[1]
https://github.com/ckhu-mediatek/linux.git-tags/commits/mediatek-drm-next-5.6

Regards,
CK

> Regards,
> Matthias
> 
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