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Date: Thu, 19 Sep 2013 10:43:49 +0200 From: Peter Zijlstra <peterz@...radead.org> To: eranian@...il.com Cc: Vince Weaver <vince@...ter.net>, Ingo Molnar <mingo@...nel.org>, Peter Anvin <hpa@...or.com>, LKML <linux-kernel@...r.kernel.org>, adrian.hunter@...el.com, Thomas Gleixner <tglx@...utronix.de>, linux-tip-commits@...r.kernel.org Subject: Re: [tip:perf/core] perf: Fix broken union in ' struct perf_event_mmap_page' On Wed, Sep 18, 2013 at 08:33:53PM +0200, Stephane Eranian wrote: > On Wed, Sep 18, 2013 at 5:42 PM, Peter Zijlstra <peterz@...radead.org> wrote: > > On Wed, Sep 18, 2013 at 10:19:32AM -0400, Vince Weaver wrote: > >> Can you point to any code that is fixed by the commit? > > > > I have some, but I don't think a lot of people use it. > > > > Would you be ok with something like the below? It should preserve > > functionality for code that only cares about cap_usr_rdpmc (PAPI). > > > > Stephane, does libpfm use any of these? > > > Yes, there is an example using this. Need to verify it is not broken > currently (self_count.c). So if that only uses cap_usr_rdpmc, you have the same issue as Vince and the proposed solutions would work for you too. If you also use cap_usr_time we've a bit of a problem. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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