linux-kernel - Re: [PATCH] drm/imx: move 'legacyfb

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Date:   Thu, 4 Oct 2018 21:35:43 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     noralf@...nnes.org, Daniel Vetter <daniel.vetter@...ll.ch>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Lucas Stach <l.stach@...gutronix.de>,
        Sam Ravnborg <sam@...nborg.org>,
        Souptick Joarder <jrdr.linux@...il.com>,
        Leonard Crestez <leonard.crestez@....com>, tzimmermann@...e.de,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/imx: move 'legacyfb_depth' definition out of #ifdef

On Thu, Oct 04, 2018 at 05:04:21PM +0200, Arnd Bergmann wrote:
> On Thu, Oct 4, 2018 at 4:43 PM Noralf Trønnes <noralf@...nnes.org> wrote:
> > Den 04.10.2018 09.48, skrev Daniel Vetter:
> > > On Wed, Oct 3, 2018 at 9:51 PM Arnd Bergmann <arnd@...db.de> wrote:
> > >> On Wed, Oct 3, 2018 at 6:13 PM Daniel Vetter <daniel@...ll.ch> wrote:
> > >>> On Wed, Oct 03, 2018 at 05:49:32PM +0200, Noralf Trønnes wrote:
> > >>>>
> > >>>> Den 02.10.2018 22.58, skrev Arnd Bergmann:
> > >>>>> The variable is now referenced unconditionally, but still
> > >>>>> declared in an #ifdef:
> > >>>>>
> > >>>>> drivers/gpu/drm/imx/imx-drm-core.c: In function 'imx_drm_bind':
> > >>>>> drivers/gpu/drm/imx/imx-drm-core.c:264:6: error: 'legacyfb_depth' undeclared (first use in this function); did you mean 'lockdep_depth'?
> > >>>>>
> > >>>>> Remove the #ifdef so it can always be accessed.
> > >>>>>
> > >>>>> Fixes: f53705fd9803 ("drm/imx: Use drm_fbdev_generic_setup()")
> > >>>>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > >>>>> ---
> > >>>> I've already applied the previous one you sent:
> > >>>> https://cgit.freedesktop.org/drm/drm-misc/commit/?id=064b06bbf117f8b5e64a5143e970d5a1cf602fd6
> > >>>>
> > >>>> Not sure when it reaches linux-next now that we are past rc6.
> > >>> Only once we're past -rc1.
> > >> Can we revert f53705fd9803 in linux-next then to prevent the regression from
> > >> making it into 4.20?
> > > Probably simpler to cherry pick the fix from drm-misc-next to
> > > drm-misc-next-fixes. Noralf, can you pls do that?
> >
> > Would this be the correct procudure:
> >
> >      dim update-branches
> >      dim create-workdir drm-misc-next-fixes
> >      <build>
> >      CONFIG_DRM_FBDEV_EMULATION=n
> >      <build will break>
> >      git cherry-pick 064b06bbf117f8b5e64a5143e970d5a1cf602fd6
> >      <build passes>
> >      dim push-branch drm-misc-next-fixes
> >
> > I read that cherry picking creates a new commit with a new hash.
> > But since you ask me to do this, I assume git will handle this when
> > branches are merged?
> 
> The git history will show both commit IDs, which is a bit ugly but
> ok if it's rare enough. There is a chance for creating a conflict if the
> backport changes context, or one branch contains extra changes
> that touch the same lines, but usually this is not a problem.

+1, and your recipe looks good too. drm-intel works entirely on these
cherry-picks, and we've done it a few times in drm-misc too. Having to
cherry-pick is one of the downsides of group maintainership, since you
really can't rebase trees at will. Definitely not the -next queue.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch