Messages in this thread | | | Subject | Re: [Patch v2] sysfs: add lockdep class support to s_active | From | (Eric W. Biederman) | Date | Fri, 05 Feb 2010 01:01:47 -0800 |
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Amerigo Wang <amwang@redhat.com> writes:
> Recently we met a lockdep warning from sysfs during s2ram or cpu hotplug. > As reported by several people, it is something like:
The interesting case is the cpu hotplug is actually a problem. It isn't useful to get a complaint about the non-problems code paths triggered by pm. However my earlier review spotted a real deadlock case. Where in one of the sysfs attributes we iterate over the list of online cpus and that appeared to an attribute that removing a cpu would remove from sysfs...
Eric
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