Messages in this thread | | | Subject | Re: sched domains bringup race? | From | Nathan Lynch <> | Date | Thu, 22 Jul 2004 16:55:40 -0500 |
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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? > > 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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