Re: [PATCH] drm/amdgpu: use bitmap_clear() in amdgpu_amdkfd_device_init()

kernel test robot
2026-04-25T15:58:41Z

Hi Yury,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on linus/master v7.0 next-20260424]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url: https://github.com/intel-lab-lkp/linux/commits/Yury-Norov/drm-amdgpu-use-bitmap_clear-in-amdgpu_amdkfd_device_init/20260424-111821
base: https://gitlab.freedesktop.org/drm/misc/kernel.git drm-misc-next
patch link: https://lore.kernel.org/r/20260424005218.147961-1-ynorov%40nvidia.com
patch subject: [PATCH] drm/amdgpu: use bitmap_clear() in amdgpu_amdkfd_device_init()
config: csky-allmodconfig (https://download.01.org/0day-ci/archive/20260425/202604252305.5nmLNigU-lkp@intel.com/config)
compiler: csky-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260425/202604252305.5nmLNigU-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202604252305.5nmLNigU-lkp@intel.com/

All warnings (new ones prefixed by >>):

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c: In function 'amdgpu_amdkfd_device_init':
>> drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c:170:13: warning: unused variable 'i' [-Wunused-variable]
170 | int i;
| ^

vim +/i +170 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c

c0125b848abecf Le Ma 2024-01-25 167
dc102c436f1238 Andres Rodriguez 2017-02-01 168 void amdgpu_amdkfd_device_init(struct amdgpu_device *adev)
130e0371b7d454 Oded Gabbay 2015-06-12 169 {
234441dd49bcd9 Yong Zhao 2019-01-09 @170 int i;
d0b63bb3385c56 Andres Rodriguez 2017-02-03 171 int last_valid_bit;
611736d8447c0c Felix Kuehling 2018-11-19 172
27fb73a0e3aa74 Mukul Joshi 2023-04-25 173 amdgpu_amdkfd_gpuvm_init_mem_limits();
27fb73a0e3aa74 Mukul Joshi 2023-04-25 174
611736d8447c0c Felix Kuehling 2018-11-19 175 if (adev->kfd.dev) {
130e0371b7d454 Oded Gabbay 2015-06-12 176 struct kgd2kfd_shared_resources gpu_resources = {
40111ec2298f44 Felix Kuehling 2020-06-24 177 .compute_vmid_bitmap =
40111ec2298f44 Felix Kuehling 2020-06-24 178 ((1 << AMDGPU_NUM_VMID) - 1) -
40111ec2298f44 Felix Kuehling 2020-06-24 179 ((1 << adev->vm_manager.first_kfd_vmid) - 1),
d0b63bb3385c56 Andres Rodriguez 2017-02-03 180 .num_pipe_per_mec = adev->gfx.mec.num_pipe_per_mec,
155494dbbbf4d6 Felix Kuehling 2018-02-06 181 .num_queue_per_pipe = adev->gfx.mec.num_queue_per_pipe,
155494dbbbf4d6 Felix Kuehling 2018-02-06 182 .gpuvm_size = min(adev->vm_manager.max_pfn
155494dbbbf4d6 Felix Kuehling 2018-02-06 183 << AMDGPU_GPU_PAGE_SHIFT,
ad9a5b78f585e9 Christian König 2018-08-27 184 AMDGPU_GMC_HOLE_START),
4a580877bdcb83 Luben Tuikov 2020-08-24 185 .drm_render_minor = adev_to_drm(adev)->render->index,
234441dd49bcd9 Yong Zhao 2019-01-09 186 .sdma_doorbell_idx = adev->doorbell_index.sdma_engine,
cc009e613de656 Mukul Joshi 2022-04-26 187 .enable_mes = adev->enable_mes,
130e0371b7d454 Oded Gabbay 2015-06-12 188 };
130e0371b7d454 Oded Gabbay 2015-06-12 189
d0b63bb3385c56 Andres Rodriguez 2017-02-03 190 /* this is going to have a few of the MSBs set that we need to
0d87c9cfc08e15 Kent Russell 2019-05-01 191 * clear
0d87c9cfc08e15 Kent Russell 2019-05-01 192 */
e6945304187dea Yong Zhao 2020-01-30 193 bitmap_complement(gpu_resources.cp_queue_bitmap,
be697aa3a78ef8 Le Ma 2022-07-27 194 adev->gfx.mec_bitmap[0].queue_bitmap,
68fa72a437ea3b Mukul Joshi 2023-09-06 195 AMDGPU_MAX_QUEUES);
d0b63bb3385c56 Andres Rodriguez 2017-02-03 196
3447d220155bd9 Jay Cornwall 2017-07-13 197 last_valid_bit = 1 /* only first MEC can have compute queues */
d0b63bb3385c56 Andres Rodriguez 2017-02-03 198 * adev->gfx.mec.num_pipe_per_mec
d0b63bb3385c56 Andres Rodriguez 2017-02-03 199 * adev->gfx.mec.num_queue_per_pipe;
25259687589365 Yury Norov 2026-04-23 200 bitmap_clear(gpu_resources.cp_queue_bitmap, last_valid_bit,
25259687589365 Yury Norov 2026-04-23 201 AMDGPU_MAX_QUEUES - last_valid_bit);
d0b63bb3385c56 Andres Rodriguez 2017-02-03 202
dc102c436f1238 Andres Rodriguez 2017-02-01 203 amdgpu_doorbell_get_kfd_info(adev,
130e0371b7d454 Oded Gabbay 2015-06-12 204 &gpu_resources.doorbell_physical_address,
130e0371b7d454 Oded Gabbay 2015-06-12 205 &gpu_resources.doorbell_aperture_size,
130e0371b7d454 Oded Gabbay 2015-06-12 206 &gpu_resources.doorbell_start_offset);
c5892230d98b04 Shaoyun Liu 2018-03-23 207
1f86805adc3432 Yong Zhao 2019-02-13 208 /* Since SOC15, BIF starts to statically use the
1f86805adc3432 Yong Zhao 2019-02-13 209 * lower 12 bits of doorbell addresses for routing
1f86805adc3432 Yong Zhao 2019-02-13 210 * based on settings in registers like
1f86805adc3432 Yong Zhao 2019-02-13 211 * SDMA0_DOORBELL_RANGE etc..
1f86805adc3432 Yong Zhao 2019-02-13 212 * In order to route a doorbell to CP engine, the lower
1f86805adc3432 Yong Zhao 2019-02-13 213 * 12 bits of its address has to be outside the range
1f86805adc3432 Yong Zhao 2019-02-13 214 * set for SDMA, VCN, and IH blocks.
642a0e80262af8 Felix Kuehling 2018-04-10 215 */
234441dd49bcd9 Yong Zhao 2019-01-09 216 if (adev->asic_type >= CHIP_VEGA10) {
1f86805adc3432 Yong Zhao 2019-02-13 217 gpu_resources.non_cp_doorbells_start =
1f86805adc3432 Yong Zhao 2019-02-13 218 adev->doorbell_index.first_non_cp;
1f86805adc3432 Yong Zhao 2019-02-13 219 gpu_resources.non_cp_doorbells_end =
1f86805adc3432 Yong Zhao 2019-02-13 220 adev->doorbell_index.last_non_cp;
234441dd49bcd9 Yong Zhao 2019-01-09 221 }
130e0371b7d454 Oded Gabbay 2015-06-12 222
8e2712e71bfc97 shaoyunl 2021-02-16 223 adev->kfd.init_complete = kgd2kfd_device_init(adev->kfd.dev,
d69a3b762dc4c9 Mukul Joshi 2022-05-09 224 &gpu_resources);
b5fd0cf3ea377a Andrey Grodzovsky 2022-05-17 225
2302d507149f0a Philip Yang 2022-10-03 226 amdgpu_amdkfd_total_mem_size += adev->gmc.real_vram_size;
2302d507149f0a Philip Yang 2022-10-03 227
b5fd0cf3ea377a Andrey Grodzovsky 2022-05-17 228 INIT_WORK(&adev->kfd.reset_work, amdgpu_amdkfd_reset_work);
130e0371b7d454 Oded Gabbay 2015-06-12 229 }
130e0371b7d454 Oded Gabbay 2015-06-12 230 }
130e0371b7d454 Oded Gabbay 2015-06-12 231

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