dvh...@linux.vnet.ibm.com wrote on 09/02/2010 01:04:28 AM:
> Subject
>
> Re: [PATCH][RFC] preempt_count corruption across H_CEDE call with
> CONFIG_PREEMPT on pseries
> With this in place, we no longer see the preempt_count dropping below
> zero. However, if I offline/online a CPU about 246 times I hit the
> opposite problem, a preempt_count() overflow. There appears to be a
> missing preempt_enable() somewhere in the offline/online paths.
This (preempt_count overflow) also occurred in mainline (with
CONFIG_PREEMPT=y) in 2.6.35, but not in 2.6.36-rc3. A
bisect seems to indicate it was fixed with
a7c2bb8279d20d853e43c34584eaf2b039de8026 "powerpc: Re-enable preemption
before cpu_die()".
Which may look familiar. :-)
It looks like this patch went to mainline (likely via the powerpc tree),
but may
have not gotten back into the -rt branch.
-Will
>
> --
> Darren Hart
> IBM Linux Technology Center
> Real-Time Linux Team
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/linuxppc-dev
