linux-kernel - Clang warning in drivers/gpu/drm/amd/amdgpu/amdgpu

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Date:   Tue, 19 Mar 2019 17:54:06 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        xinhui pan <xinhui.pan@....com>
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Clang warning in drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c

Hi all,

The introduction of this file in commit dbd249c24427 ("drm/amdgpu: add
amdgpu_ras.c to support ras (v2)") introduces the following Clang
warnings:

drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:544:23: warning: implicit conversion from enumeration type 'enum amdgpu_ras_block' to different enumeration type 'enum ta_ras_block' [-Wenum-conversion]
                        .block_id =  head->block,
                                     ~~~~~~^~~~~
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:545:24: warning: implicit conversion from enumeration type 'enum amdgpu_ras_error_type' to different enumeration type 'enum ta_ras_error_type' [-Wenum-conversion]
                        .error_type = head->type,
                                      ~~~~~~^~~~
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:549:23: warning: implicit conversion from enumeration type 'enum amdgpu_ras_block' to different enumeration type 'enum ta_ras_block' [-Wenum-conversion]
                        .block_id =  head->block,
                                     ~~~~~~^~~~~
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:550:24: warning: implicit conversion from enumeration type 'enum amdgpu_ras_error_type' to different enumeration type 'enum ta_ras_error_type' [-Wenum-conversion]
                        .error_type = head->type,
                                      ~~~~~~^~~~
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:650:26: warning: implicit conversion from enumeration type 'enum amdgpu_ras_block' to different enumeration type 'enum ta_ras_block' [-Wenum-conversion]
                .block_id = info->head.block,
                            ~~~~~~~~~~~^~~~~
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:651:35: warning: implicit conversion from enumeration type 'enum amdgpu_ras_error_type' to different enumeration type 'enum ta_ras_error_type' [-Wenum-conversion]
                .inject_error_type = info->head.type,
                                     ~~~~~~~~~~~^~~~
6 warnings generated.

Normally, I would sent a fix for this myself but I am not entirely sure
why these two enumerated types exist when one would do since they have
the same values minus the prefix. In fact, the ta_ras_{block,error_type}
values are never used aside from being defined. Some clarification would
be appreciated.

Thank you,
Nathan