Re: Rough notes from sys_membarrier() lightning BoF

[Peter Zijlstra]

On Thu, Sep 21, 2017 at 10:23:39AM -0700, James Bottomley wrote:

>  We have one system that locks up if
> multiple CPUs have outstanding coherency operations on the private bus,
> but that's only one annoying CPU (which we manage with a special lock
> inside the PA-RISC mmu code).

Hehe, yeah. I saw that code recently and had a WTF moment ;-)