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Date:   Wed, 15 Jan 2020 15:33:47 +0100
From:   Peter Zijlstra <>
To:     Jason Gunthorpe <>
Cc:     Christoph Hellwig <>,,, Waiman Long <>,
        Thomas Gleixner <>,
        Ingo Molnar <>, Will Deacon <>,
        Andrew Morton <>,,,,
Subject: Re: RFC: hold i_rwsem until aio completes

On Wed, Jan 15, 2020 at 09:24:28AM -0400, Jason Gunthorpe wrote:

> I was interested because you are talking about allowing the read/write side
> of a rw sem to be held across a return to user space/etc, which is the
> same basic problem.

No it is not; allowing the lock to be held across userspace doesn't
change the owner. This is a crucial difference, PI depends on there
being a distinct owner. That said, allowing the lock to be held across
userspace still breaks PI in that it completely wrecks the ability to
analyze the critical section.

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