drm/amdkfd: simplify svm_range_unmap_from_gpus()

The function calls bitmap_or() followed by for_each_set_bit().
Switch it to the dedicated for_each_or_bit() and drop the temporary
bitmap.

Signed-off-by: Yury Norov <ynorov@nvidia.com>
Signed-off-by: Felix Kuehling <felix.kuehling@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: Yury Norov

drivers/gpu/drm/amd/amdkfd/kfd_svm.c

@@ -1372,7 +1372,6 @@ static int
 svm_range_unmap_from_gpus(struct svm_range *prange, unsigned long start,
 			  unsigned long last, uint32_t trigger)
 {
-	DECLARE_BITMAP(bitmap, MAX_GPU_INSTANCE);
 	struct kfd_process_device *pdd;
 	struct dma_fence *fence = NULL;
 	struct kfd_process *p;
@@ -1390,11 +1389,9 @@ svm_range_unmap_from_gpus(struct svm_range *prange, unsigned long start,
 		prange->mapped_to_gpu = false;
 	}
 
-	bitmap_or(bitmap, prange->bitmap_access, prange->bitmap_aip,
-		  MAX_GPU_INSTANCE);
 	p = container_of(prange->svms, struct kfd_process, svms);
 
-	for_each_set_bit(gpuidx, bitmap, MAX_GPU_INSTANCE) {
+	for_each_or_bit(gpuidx, prange->bitmap_access, prange->bitmap_aip, MAX_GPU_INSTANCE) {
 		pr_debug("unmap from gpu idx 0x%x\n", gpuidx);
 		pdd = kfd_process_device_from_gpuidx(p, gpuidx);
 		if (!pdd) {