| In recent kernels, %pV will copy the va_list before using it. | |
| This isn't true for all kernels, so copy the va_list for use | |
| by the dev_*() functions, otherwise the kernel will crash if | |
| the message is printed and traced. | |
| This is required for kernels <= 3.1, as otherwise it would | |
| those kernels would crash. |