Re: [RFC][PATCH 00/13] percpu rwsem -v2

[Peter Zijlstra]

On Tue, Jun 23, 2015 at 09:10:03AM -0700, Davidlohr Bueso wrote:
> On Mon, 2015-06-22 at 14:16 +0200, Peter Zijlstra wrote:
> > This series converts the cpu hotplug lock into a percpu-rwsem to provide a 3rd
> > user.
> 
> Curious, why not also mem hotplug? It seems to use the exact same
> locking mayhem than cpu.

Because it looks like they 'forgot' to copy the notifiers and therefore
I suspect we could simplify things. We might not need the recursive
nonsense.

But I've not yet actually looked at it much.

I was indeed greatly saddened that these people copied cpu hotplug;
clearly they had not gotten the memo that cpu hotplug is a trainwreck.
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