drm/amdkfd: use kvcalloc() instead of kvmalloc() in kfd_migrate

simplify programming with existing functions.
Signed-off-by: Yang Wang <KevinYang.Wang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -410,7 +410,6 @@ svm_migrate_vma_to_vram(struct amdgpu_device *adev, struct svm_range *prange,
 	struct migrate_vma migrate;
 	unsigned long cpages = 0;
 	dma_addr_t *scratch;
-	size_t size;
 	void *buf;
 	int r = -ENOMEM;
 
@@ -421,9 +420,9 @@ svm_migrate_vma_to_vram(struct amdgpu_device *adev, struct svm_range *prange,
 	migrate.flags = MIGRATE_VMA_SELECT_SYSTEM;
 	migrate.pgmap_owner = SVM_ADEV_PGMAP_OWNER(adev);
 
-	size = 2 * sizeof(*migrate.src) + sizeof(uint64_t) + sizeof(dma_addr_t);
-	size *= npages;
-	buf = kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
+	buf = kvcalloc(npages,
+		       2 * sizeof(*migrate.src) + sizeof(uint64_t) + sizeof(dma_addr_t),
+		       GFP_KERNEL);
 	if (!buf)
 		goto out;
 
@@ -665,7 +664,6 @@ svm_migrate_vma_to_ram(struct amdgpu_device *adev, struct svm_range *prange,
 	struct dma_fence *mfence = NULL;
 	struct migrate_vma migrate;
 	dma_addr_t *scratch;
-	size_t size;
 	void *buf;
 	int r = -ENOMEM;
 
@@ -676,9 +674,10 @@ svm_migrate_vma_to_ram(struct amdgpu_device *adev, struct svm_range *prange,
 	migrate.flags = MIGRATE_VMA_SELECT_DEVICE_PRIVATE;
 	migrate.pgmap_owner = SVM_ADEV_PGMAP_OWNER(adev);
 
-	size = 2 * sizeof(*migrate.src) + sizeof(uint64_t) + sizeof(dma_addr_t);
-	size *= npages;
-	buf = kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
+	buf = kvcalloc(npages,
+		       2 * sizeof(*migrate.src) + sizeof(uint64_t) + sizeof(dma_addr_t),
+		       GFP_KERNEL);
+
 	if (!buf)
 		goto out;
 

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

@@ -149,8 +149,7 @@ svm_range_dma_map_dev(struct amdgpu_device *adev, struct svm_range *prange,
 	int i, r;
 
 	if (!addr) {
-		addr = kvmalloc_array(prange->npages, sizeof(*addr),
-				      GFP_KERNEL | __GFP_ZERO);
+		addr = kvcalloc(prange->npages, sizeof(*addr), GFP_KERNEL);
 		if (!addr)
 			return -ENOMEM;
 		prange->dma_addr[gpuidx] = addr;