linux-kernel - Re: perf hw in kexeced kernel broken in tip

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Date:	Wed, 08 Dec 2010 11:39:53 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Don Zickus <dzickus@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Vivek Goyal <vgoyal@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Jason Wessel <jason.wessel@...driver.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Haren Myneni <hbabu@...ibm.com>
Subject: Re: perf hw  in kexeced kernel broken in tip

On Tue, 2010-12-07 at 16:26 -0800, Yinghai Lu wrote:
> > +++ b/arch/x86/kernel/cpu/perf_event.c
> > @@ -377,10 +377,10 @@ static bool check_hw_exists(void)
> >       u64 val, val_new = 0;
> >       int ret = 0;
> >  
> > -     val = 0xabcdUL;
> > -     ret |= checking_wrmsrl(x86_pmu.perfctr, val);
> > -     ret |= rdmsrl_safe(x86_pmu.perfctr, &val_new);
> > -     if (ret || val != val_new)
> > +     val = 0xabUL;
> > +     ret |= checking_wrmsrl(x86_pmu.eventsel, val);
> > +     ret |= rdmsrl_safe(x86_pmu.eventsel, &val_new);
> > +     if (ret || val != (val_new & 0xFF))
> >               return false;
> >  
> >       return true;
> 
> Thanks. it fixes the problem.
> 
Won't merge it though, I think it stinks..
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