drm/ttm: Account for kernel allocations in kernel zone only

Don't account for them in other zones such as dma32. The kernel page
allocator has its own heuristics to avoid exhausting special zones
for regular kernel allocations.
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/ttm/ttm_memory.c

@@ -522,7 +522,7 @@ static void ttm_mem_global_free_zone(struct ttm_mem_global *glob,
 void ttm_mem_global_free(struct ttm_mem_global *glob,
 			 uint64_t amount)
 {
-	return ttm_mem_global_free_zone(glob, NULL, amount);
+	return ttm_mem_global_free_zone(glob, glob->zone_kernel, amount);
 }
 EXPORT_SYMBOL(ttm_mem_global_free);
 
@@ -621,10 +621,10 @@ int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
 {
 	/**
 	 * Normal allocations of kernel memory are registered in
-	 * all zones.
+	 * the kernel zone.
 	 */
 
-	return ttm_mem_global_alloc_zone(glob, NULL, memory, ctx);
+	return ttm_mem_global_alloc_zone(glob, glob->zone_kernel, memory, ctx);
 }
 EXPORT_SYMBOL(ttm_mem_global_alloc);