linux-kernel - Re: [PATCH -next] drm/amdkfd: Fix -Wunused-const-variable warning

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Date:   Thu, 10 Sep 2020 15:26:33 +0800
From:   Huang Rui <ray.huang@....com>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     Felix.Kuehling@....com, alexander.deucher@....com,
        christian.koenig@....com, airlied@...ux.ie, daniel@...ll.ch,
        Yong.Zhao@....com, dri-devel@...ts.freedesktop.org,
        amd-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] drm/amdkfd: Fix -Wunused-const-variable warning

On Thu, Sep 10, 2020 at 10:55:32AM +0800, YueHaibing wrote:
> If KFD_SUPPORT_IOMMU_V2 is not set, gcc warns:
> 
> drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_device.c:121:37: warning: ‘raven_device_info’ defined but not used [-Wunused-const-variable=]
>  static const struct kfd_device_info raven_device_info = {
>                                      ^~~~~~~~~~~~~~~~~
> 
> Move it to ifdef block.
> 
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> ---

Raven already has the fallback path, so it should be out of IOMMU v2 flag.

You may want to move raven_device_info out of IOMMU v2 flag in kfd_supported_devices[][2] as well.

Thanks,
Ray

>  drivers/gpu/drm/amd/amdkfd/kfd_device.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
> index 0e71a0543f98..cae4df259e26 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
> @@ -116,7 +116,6 @@ static const struct kfd_device_info carrizo_device_info = {
>  	.num_xgmi_sdma_engines = 0,
>  	.num_sdma_queues_per_engine = 2,
>  };
> -#endif
>  
>  static const struct kfd_device_info raven_device_info = {
>  	.asic_family = CHIP_RAVEN,
> @@ -135,6 +134,7 @@ static const struct kfd_device_info raven_device_info = {
>  	.num_xgmi_sdma_engines = 0,
>  	.num_sdma_queues_per_engine = 2,
>  };
> +#endif
>  
>  static const struct kfd_device_info hawaii_device_info = {
>  	.asic_family = CHIP_HAWAII,
> -- 
> 2.17.1
> 
> 
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