Hi Fengguang Thank you for your report > commit 6e20a0a429bd4dc07d6de16d9c247270e04e4aa0 > Author: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx> > Commit: Linus Walleij <linus.walleij@xxxxxxxxxx> > CommitDate: Thu Aug 23 23:41:17 2012 +0200 > > gpio: pcf857x: enable gpio_to_irq() support > > config: x86_64-allmodconfig > > All error/warnings: > > ERROR: "irq_set_chip_and_handler_name" undefined! > ERROR: "dummy_irq_chip" undefined! I believe this issue was solved by these patches http://git.kernel.org/tip/17d83127d4c2b322dd8f217e0ac08c66eb403779 http://git.kernel.org/tip/b3ae66f209e8929db62b5a5f874ab2cdcf5ef1d4 or 17d8312 genirq: Export dummy_irq_chip b3ae66f genirq: Export irq_set_chip_and_handler_name() -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html