Re: lockdep: access percpu variable too early

From: Ingo Molnar
Date: Wed Mar 06 2013 - 05:21:27 EST



* Ming Lei <ming.lei@xxxxxxxxxxxxx> wrote:

> Hi,
>
> The percpu variables of 'lockdep_stats' and 'cpu_lock_stat' may be accessed before
> percpu area is brought up in case of CONFIG_DEBUG_LOCKDEP/CONFIG_LOCK_STAT, so
> these variables in non-boot CPUs will be initialized incorrectly.

What's the practical effect of it? Do we copy the value from the boot CPU and thus
the secondary CPUs start with slightly increased stats?

Thanks,

Ingo
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