Re: [PATCH RFC 04/12] kernel/user: Allow user::locked_vm to be usable for iommufd

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On Thu, Mar 24, 2022 at 11:50:47AM +0800, Jason Wang wrote:

> It's simply because we don't want to break existing userspace. [1]

I'm still waiting to hear what exactly breaks in real systems.

As I explained this is not a significant change, but it could break
something in a few special scenarios.

Also the one place we do have ABI breaks is security, and ulimit is a
security mechanism that isn't working right. So we do clearly need to
understand *exactly* what real thing breaks - if anything.

Jason



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