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SubjectRe: [PATCH 4/4] epoll: ep_unregister_pollwait() can use the freed pwq->whead
On Thu, Feb 23, 2012 at 7:44 AM, Oleg Nesterov <> wrote:
> Or we can rely on the fact that sighand_cachep is SLAB_DESTROY_BY_RCU,
> and assume that ->whead is always rcu-protected if it can go away.
> In this case we don't need 3/4 (although it makes sense to add the
> fat comment), and 4/4 can be simplified, see below.


Can you also get rid of 1/4, because quite frankly, adding that
BUG_ON() is just annoying. Either the thing gets fixed or not, but at
no point is it ok to say "ok, I'm going to fix it, but before I do
I'll just make it much worse".


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