Re: [tip:perfcounters/core] perf_counter: x86: Fix call-chain support to use NMI-safe methods
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- Subject: Re: [tip:perfcounters/core] perf_counter: x86: Fix call-chain support to use NMI-safe methods
- From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 15 Jun 2009 13:27:05 -0700 (PDT)
- Cc: Ingo Molnar <mingo@xxxxxxx>, Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>, mingo@xxxxxxxxxx, hpa@xxxxxxxxx, paulus@xxxxxxxxx, acme@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, a.p.zijlstra@xxxxxxxxx, penberg@xxxxxxxxxxxxxx, vegard.nossum@xxxxxxxxx, efault@xxxxxx, npiggin@xxxxxxx, tglx@xxxxxxxxxxxxx, linux-tip-commits@xxxxxxxxxxxxxxx
- In-reply-to: <4A36ABB5.1040109@xxxxxxxx>
- References: <tip-74193ef0ecab92535c8517f082f1f50504526c9b@xxxxxxxxxxxxxx> <alpine.LFD.2.01.0906151007560.3305@xxxxxxxxxxxxxxxxxxxxx> <20090615171845.GA7664@xxxxxxx> <alpine.LFD.2.01.0906151029160.3305@xxxxxxxxxxxxxxxxxxxxx> <20090615180527.GB4201@Krystal> <alpine.LFD.2.01.0906151125320.6276@xxxxxxxxxxxxxxxxxxxxx> <20090615183649.GA16999@xxxxxxx> <alpine.LFD.2.01.0906151152170.6276@xxxxxxxxxxxxxxxxxxxxx> <4A36ABB5.1040109@xxxxxxxx>
- User-agent: Alpine 2.01 (LFD 1184 2008-12-16)
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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