linux-kernel - Re: [patch 1/4] Linux Kernel Markers

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Date:	Thu, 20 Sep 2007 20:58:37 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [patch 1/4] Linux Kernel Markers - Architecture Independent
	Code

On Tue, Sep 18, 2007 at 05:13:25PM -0400, Mathieu Desnoyers wrote:
> +/*
> + * Sets the probe callback corresponding to one marker.
> + */
> +static int set_marker(struct marker_entry **entry,
> +			struct __mark_marker *elem)
> +{
> +	int ret;
> +	BUG_ON(strcmp((*entry)->name, elem->name) != 0);

Can you switch this at least to WARN_ON?  Killing a system with X
running where the user just sees a freeze is not that nice. But a nasty
message in dmesg is very noticable.

-- Steve

> +
> +	if ((*entry)->format) {
> +		if (strcmp((*entry)->format, elem->format) != 0) {
> +			printk(KERN_NOTICE
> +				"Format mismatch for probe %s "
> +				"(%s), marker (%s)\n",
> +				(*entry)->name,
> +				(*entry)->format,
> +				elem->format);
> +			return -EPERM;
> +		}
> +	} else {
> +		ret = marker_set_format(entry, elem->format);
> +		if (ret)
> +			return ret;
> +	}
> +	elem->call = (*entry)->probe;
> +	elem->pdata = (*entry)->pdata;
> +	_immediate_set(elem->state, 1);
> +	return 0;
> +}
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