Re: [Xen-devel] Re: [PATCH] x86: fix the potential of encountering panic "IO-APIC + timer doesn't work! ..."

[Ingo Molnar <mingo@xxxxxxx>]

* Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote:

> On 12/12/2008 09:13, "Ingo Molnar" <mingo@xxxxxxx> wrote:
> 
> >>> From all I can tell, the below reproduced full description of the
> >> original Linux patch applies to Xen, too - at least in the watchdog
> >> enabled case IRQs can be enabled when entering setup_IO_APIC(). My
> >> attention to this change really got caught just by the fact that it got
> >> added to our (2.6.16-based) SLE10 kernel pretty recently.
> > 
> > note that we had to revert that eventually. The real solution is an 
> > array of fixes from Maciej spread out over many months.
> 
> Does it do more harm than good on some systems, or is it simply not a 
> comprehensive fix?

more harm than good - fixes some, breaks others. Have a look at the 
latest upstream io_apic.c, that has it all settled down reasonably well.

        Ingo

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