Re: [Patch v2] sysfs: add lockdep class support to s_active

[Eric W. Biederman]

Amerigo Wang <amwang@xxxxxxxxxx> 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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/