linux-kernel - linux-next: build failure after merge of the amdgpu tree

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Message-ID: <20230130122051.534df03e@canb.auug.org.au>
Date:   Mon, 30 Jan 2023 12:20:51 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Alex Deucher <alexdeucher@...il.com>
Cc:     Dave Airlie <airlied@...hat.com>,
        Harry Wentland <harry.wentland@....com>,
        Lyude Paul <lyude@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: linux-next: build failure after merge of the amdgpu tree

Hi all,

After merging the amdgpu tree, today's linux-next build (x86_64
allmodconfig) failed like this:

drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c: In function 'amdgpu_dm_atomic_check':
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:9706:41: error: redeclaration of 'mgr' with no linkage
 9706 |         struct drm_dp_mst_topology_mgr *mgr;
      |                                         ^~~
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:9697:41: note: previous declaration of 'mgr' with type 'struct drm_dp_mst_topology_mgr *'
 9697 |         struct drm_dp_mst_topology_mgr *mgr;
      |                                         ^~~
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:9707:43: error: redeclaration of 'mst_state' with no linkage
 9707 |         struct drm_dp_mst_topology_state *mst_state;
      |                                           ^~~~~~~~~
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:9698:43: note: previous declaration of 'mst_state' with type 'struct drm_dp_mst_topology_state *'
 9698 |         struct drm_dp_mst_topology_state *mst_state;
      |                                           ^~~~~~~~~

Caused by commit

  c689e1e362ea ("drm/amdgpu/display/mst: Fix mst_state->pbn_div and slot count assignments")

interacting with commits

  1119e1f9636b ("drm/amdgpu/display/mst: Fix mst_state->pbn_div and slot count assignments")
  f439a959dcfb ("amdgpu: fix build on non-DCN platforms.")

from Linus' tree.

Please can you guys think about your bug fixing process?

I have applied the following merge fix for today:

From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Mon, 30 Jan 2023 12:12:21 +1100
Subject: [PATCH] amdgpu: fix up for "drm/amdgpu/display/mst: Fix mst_state->pbn_div and slot count assignments"

This appears as a commit in Linus tree and again in the amdgpu tree,
but there is a following fix commit in Linus' tree.

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 8965071f595b..e1d63826927a 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -9694,8 +9694,6 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
 	struct drm_connector_state *old_con_state, *new_con_state;
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *old_crtc_state, *new_crtc_state;
-	struct drm_dp_mst_topology_mgr *mgr;
-	struct drm_dp_mst_topology_state *mst_state;
 	struct drm_plane *plane;
 	struct drm_plane_state *old_plane_state, *new_plane_state;
 	enum dc_status status;
-- 
2.35.1

-- 
Cheers,
Stephen Rothwell

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