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SubjectRe: [PATCH -next 0/2] fs/epoll: loosen irq safety when possible
On Fri, 20 Jul 2018, Andrew Morton wrote:

>We could open-code it locally. Add a couple of
>WARN_ON_ONCE(irqs_disabled())? That might need re-benchmarking with
>Xen but surely just reading the thing isn't too expensive?

We could also pass on the responsibility to lockdep and just use
lockdep_assert_irqs_disabled(). But I guess that would be less effective
than to just open code it in epoll without lockdep -- note that over 80
places in the kernel do this.


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