Re: [PATCH v2 2/3] locking/rwsem: disable preemption for spinning region

[Peter Zijlstra]

On Fri, Oct 15, 2021 at 12:13:59PM +0200, Peter Zijlstra wrote:
> On Wed, Oct 13, 2021 at 09:41:53PM +0800, Yanfei Xu wrote:
> > The spinning region rwsem_spin_on_owner() should not be preempted,
> > however the rwsem_down_write_slowpath() invokes it and don't disable
> > preemption. Fix it by adding a pair of preempt_disable/enable().
> 
> I'm thinking we should do this patch before #1, otherwise we have a
> single patch window where we'll trigger the assertion, no?

Anyway, I've stuck the lot (reordered) into my locking/core branch, lets
see what the robots make of it ;-)