Utilize M10k Memory block

Hi HRZ,The programming guide quote "You cannot use the library function malloc or the operator new to allocate physically shared memory.". So, can i realloc the buffer? The thing is i want to resize the output buffer.

data_buffer = clCreateBuffer(context, CL_MEM_ALLOC_HOST_PTR, buffer_size, NULL, &status); //initiate 
            // clEnqueueTask // some process 
            x = clEnqueueMapBuffer(queue,data_buffer,CL_TRUE,CL_MAP_WRITE | CL_MAP_READ,0,size*sizeof(float),0,NULL,NULL,&status); //read output 
             if(something) x = realloc(x, newsize*sizeof(float) //realloc new size to the output buffer
             else //take back old size