Hi Andrew, your commit b1f10002b00a ("mailbox: Add NVIDIA Tegra XUSB mailbox driver") is in today's linux-next tree (i.e., next-20150513) and it adds the following lines: +config TEGRA_XUSB_MBOX + tristate "NVIDIA Tegra XUSB Mailbox" + depends on MFD_TEGRA_XUSB At the current state, the dependency is always false since the option MFD_TEGRA_XUSB is not defined in Kconfig, and the added driver cannot be compiled. Is there a patch queued somewhere to add this missing option? I detected the issue with undertaker-checkpatch [1, 2] running on a bot in Erlangen [3] to make daily checks of commits in linux-next for #ifdef related bugs. Kind regards, Valentin [1] https://vamos.informatik.uni-erlangen.de/trac/undertaker [2] http://www.linuxplumbersconf.org/2014/ocw/proposals/1863 [3] https://www4.cs.fau.de/Research/CADOS/ -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html