From mboxrd@z Thu Jan  1 00:00:00 1970
From: Richard Weinberger <richard@nod.at>
Subject: linux-next: User Mode Linux broken
Date: Thu, 21 Oct 2010 13:15:26 +0200
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Cc: peterz@infradead.org, hpa@zytor.com, mingo@elte.hu, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, linux-next@vger.kernel.org

Thomas,

Your commit c5f7563 ("genirq: Provide compat handling for chip->enable()") 
breaks UML.
It does not start anymore.

When I apply this patch it works fine again.
http://userweb.kernel.org/~akpm/mmotm/broken-out/um-migrate-from-__do_irq-to-
generic_handle_irq.patch

Maybe your patch breaks all users of __do_IRQ()?

Thanks,
//richard