From: Wolfgang Grandegger <wg@grandegger•com>
To: linuxppc-dev <Linuxppc-dev@ozlabs•org>
Subject: irq_disable() not working
Date: Tue, 23 Sep 2008 11:08:36 +0200 [thread overview]
Message-ID: <48D8B214.2050706@grandegger.com> (raw)
Hello,
I'm trying to understand how irq_disable() is supposed to work on
PowerPC systems. Most PowerPC PIC do *not* implement the enable and
disable, but just the unmask and mask methods, e.g:
http://lxr.linux.no/linux+v2.6.26.5/arch/powerpc/sysdev/mpic.c#L867
The irq_disable() function will then call the default function
default_disable():
http://lxr.linux.no/linux+v2.6.26.5/kernel/irq/chip.c#L234
which does not *nothing*. I do not see how the interrupt gets disabled
on the hardware level. Obviously I have missed something. TIA for
clarification.
Wolfgang.
next reply other threads:[~2008-09-23 9:08 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-23 9:08 Wolfgang Grandegger [this message]
2008-09-23 9:20 ` irq_disable() not working Benjamin Herrenschmidt
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