On Wed, 2025-08-20 at 19:43 +0200, Peter Zijlstra wrote: > Yes. But supporting the shstk isn't hard (as per this patch), it exactly > matches what it already does to the normal stack. So I don't see a > reason not to do it. Thanks for explaining, and sorry for being slow. Going to blame this head cold. > > Anyway, I'm not a huge fan of any of this. I suspect FRED will make all > this fancy code totally irrelevant. But until people have FRED enabled > hardware in large quantities, I suppose this has a use. It doesn't sound too unbounded and I guess as long as it's just an optimization we can always back it out if someone finds a way to abuse it.
