linux-kernel - Re: [PATCH 2/2] hw-breakpoints: Add two reserved fields for future extensions

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Message-ID: <1259876019.3977.1559.camel@laptop>
Date:	Thu, 03 Dec 2009 22:33:39 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Prasad <prasad@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Will Deacon <will.deacon@....com>,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH 2/2] hw-breakpoints: Add two reserved fields for future
 extensions

On Thu, 2009-12-03 at 22:16 +0100, Frederic Weisbecker wrote:

> diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
> index 771d04c..89832cc 100644
> --- a/include/linux/perf_event.h
> +++ b/include/linux/perf_event.h
> @@ -221,6 +221,8 @@ struct perf_event_attr {
>  			__u64		bp_end;
>  			__u32		bp_type;
>  			__u32		bp_len;
> +			__u64		__bp_reserved_1;
> +			__u64		__bp_reserved_2;
>  		};
>  	};

Looking at that code I see:

 union {
  struct {
  }
 }

wth is that union for?

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