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

[Linus Torvalds]

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
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