linux-kernel - Re: [PATCH v5 09/18] perf: disable PERF_SAMPLE_BRANCH

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Message-ID: <1328556210.2482.20.camel@laptop>
Date:	Mon, 06 Feb 2012 20:23:30 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, acme@...hat.com,
	robert.richter@....com, ming.m.lin@...el.com, andi@...stfloor.org,
	asharma@...com, ravitillo@....gov, vweaver1@...s.utk.edu,
	khandual@...ux.vnet.ibm.com, dsahern@...il.com
Subject: Re: [PATCH v5 09/18] perf: disable PERF_SAMPLE_BRANCH_* when not
 supported

On Thu, 2012-02-02 at 13:54 +0100, Stephane Eranian wrote:
> @@ -539,6 +539,10 @@ static int armpmu_event_init(struct perf_event *event)
>         int err = 0;
>         atomic_t *active_events = &armpmu->active_events;
>  
> +       /* does not support taken branch sampling */
> +       if (has_branch_smpl(event))
> +               return -EOPNOTSUPP;
> +
>         if (armpmu->map_event(event) == -ENOENT) 

I'll make that has_branch_stack(), ok? :-)

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