Re: sched domains bringup race?

[Keshavamurthy Anil S]

On Thu, Jul 22, 2004 at 04:55:40PM -0500, Nathan Lynch wrote:
> On Mon, 2004-07-19 at 02:31, Nick Piggin wrote:
> > Keshavamurthy Anil S wrote:
> > > Even on my system which is Intel 865 chipset (P4 with HT enabled system) 
> > > I see a bug check somewhere in the schedular_tick during boot.
> > > However if I move the sched_init_smp() after do_basic_setup() the
> > > kernel boots without any problem. Any clue here?

  This was happening even without CONFIG_SCHED_SMT and later found to be
ACPI bug. Sorry for the confusion.

> > 
> > There shouldn't be any problem doing that if we have to, obviously we
> > need to know why. Is it possible that cpu_sibling_map, or one of the
> > CPU masks isn't set up correctly at the time of the call?
> 
> In 2.6.8-rc1-mm1 at least, backing this patch out fixed it for me on
> ppc64:
> 
> http://kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.8-rc1/2.6.8-rc1-mm1/broken-out/detect-too-early-schedule-attempts.patch
> 
> Code with statements of the form:
> 
> if (system_state == SYSTEM_BOOTING)
> 	/* do something boot-specific */
> else
> 	/* do something assuming system_state == SYSTEM_RUNNING */
> 
> is broken by this change.  Parts of the cpu bringup code in arch/ppc64
> do this (and thus need to be fixed if the above change is kept). 
> Chances are there is similar code in some x86 setups.
> 
> Nathan
> 
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