linux-kernel - Re: [tip:perf/core] perf: Fix broken union in ' struct perf_event_mmap

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Date:	Wed, 18 Sep 2013 20:33:53 +0200
From:	Stephane Eranian <eranian@...glemail.com>
To:	Peter Zijlstra <peterz@...radead.org>
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 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).

> --- a/include/uapi/linux/perf_event.h
> +++ b/include/uapi/linux/perf_event.h
> @@ -380,8 +380,8 @@ struct perf_event_mmap_page {
>         union {
>                 __u64   capabilities;
>                 struct {
> -                       __u64   cap_usr_time            : 1,
> -                               cap_usr_rdpmc           : 1,
> +                       __u64   cap_usr_rdpmc           : 1,
> +                               cap_usr_time            : 1,
>                                 cap_usr_time_zero       : 1,
>                                 cap_____res             : 61;
>                 };
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