linux-kernel - Re: [PATCH v2 03/14] perf: Add persistent event facilities

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Date:	Mon, 24 Jun 2013 11:32:04 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Robert Richter <rric@...nel.org>
Cc:	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
	Borislav Petkov <bp@...e.de>,
	Robert Richter <robert.richter@...aro.org>
Subject: Re: [PATCH v2 03/14] perf: Add persistent event facilities

On Tue, Jun 11, 2013 at 06:42:29PM +0200, Robert Richter wrote:
> +static struct perf_event *
> +add_persistent_event_on_cpu(unsigned int cpu, struct perf_event_attr *attr,
> +			    unsigned nr_pages)
> +{
> +	struct perf_event *event = ERR_PTR(-ENOMEM);
> +	struct pers_event_desc *desc;
> +	struct ring_buffer *buf;
> +
> +	desc = kzalloc(sizeof(*desc), GFP_KERNEL);
> +	if (!desc)
> +		goto out;
> +
> +	buf = rb_alloc(nr_pages, 0, cpu, 0);
> +	if (!buf)
> +		goto err_rb;
> +
> +	event = perf_event_create_kernel_counter(attr, cpu, NULL, NULL, NULL);
> +	if (IS_ERR(event))
> +		goto err_event;
> +
> +	rcu_assign_pointer(event->rb, buf);
> +
> +	desc->event = event;
> +	desc->attr  = attr;
> +
> +	INIT_LIST_HEAD(&desc->plist);
> +	list_add_tail(&desc->plist, &per_cpu(pers_events, cpu));
> +
> +	/* All workie, enable event now */
> +	perf_event_enable(event);
> +
> +	goto out;
> +
> + err_event:
> +	rb_put(buf);
> +
> + err_rb:
> +	kfree(desc);
> +
> + out:
> +	return event;
> +}

I generally disapprove of indented labels. None of the perf code has
that and the tools are easy to 'fix'.

My quiltrc contains:

QUILT_DIFF_OPTS="-F ^[[:alpha:]\$_].*[^:]\$"

my .gitconfig contains:

[diff "default"]
                xfuncname = "^[[:alpha:]$_].*[^:]$"

Both avoid diff thinking labels are function names.
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