From beeca08738c4c4024c81a591812bfe38f8c436c0 Mon Sep 17 00:00:00 2001
From: Paul Mackerras <paulus@samba.org>
Date: Wed, 28 Sep 2005 20:29:44 +1000
Subject: [PATCH] Don't call a NULL ack function in the generic IRQ code.

Some IRQ controllers don't need an ack function (e.g. OpenPIC on
PPC platforms) and for them we'd rather not have the overhead
of doing an indirect call to a function that does nothing.

Signed-off-by: Paul Mackerras <paulus@samba.org>
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