Re: [tip:perfcounters/core] perf_counter: x86: Fix call-chain support to use NMI-safe methods

Linus Torvalds
2009-06-15T20:29:22Z

On Mon, 15 Jun 2009, Jeremy Fitzhardinge wrote:
>
> We have to restore the usermode %gs somewhere...

None of this is useful for user-mode return _anyway_, since you have to
restore %cs/%ss too. At that point, you have to use iret.

Linus