Re: [patch] SMP races in the timer code, timer-fix-2.6.0-test7-A0

[Manfred Spraul]

Ingo Molnar wrote:

> On Sat, 11 Oct 2003, Ingo Molnar wrote:
>
>  
>
> > since this would be the 8th word-sized field in struct timer_list,
> > making it a nice round structure size.
> >    
>
> it's the 9th field in fact, due to timer->magic.
>  
I found one problem: the same timer can run on multiple cpus at the same time.

timer on cpu 0. running on cpu 0.
add_timer on cpu 1. expires immediately. running on cpu 1.

Your mail arrived out of order - thus I don't know yet if the 9th field 
is a counter or a flag - a counter might work, but is quite ugly.

--
   Manfred

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