linux-kernel - Re: [PATCH] drm/amdkfd: remove unused function get_reserved_sdma_queues

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Date:   Thu, 25 May 2023 13:14:39 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Tom Rix <trix@...hat.com>
Cc:     Felix.Kuehling@....com, alexander.deucher@....com,
        christian.koenig@....com, Xinhui.Pan@....com, airlied@...il.com,
        daniel@...ll.ch, ndesaulniers@...gle.com,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] drm/amdkfd: remove unused function
 get_reserved_sdma_queues_bitmap

On Thu, May 25, 2023 at 04:07:59PM -0400, Tom Rix wrote:
> clang with W=1 reports
> drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_device_queue_manager.c:122:24: error:
>   unused function 'get_reserved_sdma_queues_bitmap' [-Werror,-Wunused-function]
> static inline uint64_t get_reserved_sdma_queues_bitmap(struct device_queue_manager *dqm)
>                        ^
> This function is not used so remove it.
> 
> Signed-off-by: Tom Rix <trix@...hat.com>

Caused by commit 09a95a85cf3e ("drm/amdkfd: Update SDMA queue management
for GFX9.4.3") it seems.

You can actually go a step farther and remove the
reserved_sdma_queues_bitmap member from 'struct kfd_device_info' because
it is now only assigned, never read.

$ git grep reserved_sdma_queues_bitmap next-20230525
next:20230525:drivers/gpu/drm/amd/amdkfd/kfd_device.c:        kfd->device_info.reserved_sdma_queues_bitmap = 0xFULL;
next:20230525:drivers/gpu/drm/amd/amdkfd/kfd_device.c:        kfd->device_info.reserved_sdma_queues_bitmap = 0x3ULL;
next:20230525:drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c:static inline uint64_t get_reserved_sdma_queues_bitmap(struct device_queue_manager *dqm)
next:20230525:drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c:    return dqm->dev->kfd->device_info.reserved_sdma_queues_bitmap;
next:20230525:drivers/gpu/drm/amd/amdkfd/kfd_priv.h:    uint64_t reserved_sdma_queues_bitmap;

> ---
>  drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> index 493b4b66f180..2fbd0a96424f 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> @@ -119,11 +119,6 @@ unsigned int get_num_xgmi_sdma_queues(struct device_queue_manager *dqm)
>  		dqm->dev->kfd->device_info.num_sdma_queues_per_engine;
>  }
>  
> -static inline uint64_t get_reserved_sdma_queues_bitmap(struct device_queue_manager *dqm)
> -{
> -	return dqm->dev->kfd->device_info.reserved_sdma_queues_bitmap;
> -}
> -
>  static void init_sdma_bitmaps(struct device_queue_manager *dqm)
>  {
>  	bitmap_zero(dqm->sdma_bitmap, KFD_MAX_SDMA_QUEUES);
> -- 
> 2.27.0
>