linux-kernel - [PATCH] drm/amdgpu/display/mst: fix an unused-variable warning

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Date:   Thu, 26 Jan 2023 17:35:54 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Roman Li <roman.li@....com>,
        Wayne Lin <Wayne.Lin@....com>,
        Aurabindo Pillai <aurabindo.pillai@....com>,
        Stylon Wang <stylon.wang@....com>,
        hersen wu <hersenxs.wu@....com>, Lyude Paul <lyude@...hat.com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drm/amdgpu/display/mst: fix an unused-variable warning

From: Arnd Bergmann <arnd@...db.de>

The newly added code is in an #ifdef, so the variables that
are only used in there cause a warning if CONFIG_DRM_AMD_DC_DCN
is disabled:

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:9698:43: error: unused variable 'mst_state' [-Werror=unused-variable]
 9698 |         struct drm_dp_mst_topology_state *mst_state;
      |                                           ^~~~~~~~~
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:9697:41: error: unused variable 'mgr' [-Werror=unused-variable]
 9697 |         struct drm_dp_mst_topology_mgr *mgr;
      |                                         ^~~

Fixes: c689e1e362ea ("drm/amdgpu/display/mst: Fix mst_state->pbn_div and slot count assignments")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 ++
 1 file changed, 2 insertions(+)

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 be1232356f9e..c966bb05f6c7 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 +9694,10 @@ 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;
+#if defined(CONFIG_DRM_AMD_DC_DCN)
 	struct drm_dp_mst_topology_mgr *mgr;
 	struct drm_dp_mst_topology_state *mst_state;
+#endif
 	struct drm_plane *plane;
 	struct drm_plane_state *old_plane_state, *new_plane_state;
 	enum dc_status status;
-- 
2.39.0