linux-kernel - Re: [PATCH] perf, ibs: Check syscall attribute flags

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Message-ID: <504A25DB.2030100@gmail.com>
Date:	Fri, 07 Sep 2012 10:50:35 -0600
From:	David Ahern <dsahern@...il.com>
To:	Robert Richter <robert.richter@....com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf, ibs: Check syscall attribute flags

On 9/7/12 10:41 AM, Robert Richter wrote:
> +	struct perf_event_attr notsupp = {
> +		.exclude_user	= 1,
> +		.exclude_kernel	= 1,
> +		.exclude_hv	= 1,
> +		.exclude_idle	= 1,
> +		.exclude_host	= 1,
> +		.exclude_guest	= 1,
> +	};
>
>   	perf_ibs = get_ibs_pmu(event->attr.type);
>   	if (perf_ibs) {
> @@ -229,6 +237,9 @@ static int perf_ibs_init(struct perf_event *event)
>   	if (event->pmu != &perf_ibs->pmu)
>   		return -ENOENT;
>
> +	if (perf_flags(&event->attr) & perf_flags(&notsupp))
> +		return -EINVAL;
> +

Am I reading this right - if exclude_guest is set then perf_ibs_init 
returns -EINVAL?

David

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