On Tue, 2008-09-23 at 11:08 +0200, Wolfgang Grandegger wrote: > 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.
Lazy masking ? ie, look what happens if the irq happens while disabled. Ben. _______________________________________________ Linuxppc-dev mailing list [email protected] https://ozlabs.org/mailman/listinfo/linuxppc-dev
