linux-kernel - Re: [PATCH] Identify which executable object the userspace address belongs to. Store thread group leader id, and use it to lookup the address in the process's map. We could have looked up the address on thread's map, but the thread might not exist by the time we are called. The process might not exist either, but if you are reading trace

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Message-ID: <20081102212512.GF28946@ZenIV.linux.org.uk>
Date:	Sun, 2 Nov 2008 21:25:12 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	T??r??k Edwin <edwintorok@...il.com>
Cc:	mingo@...e.hu, srostedt@...hat.com, a.p.zijlstra@...llo.nl,
	sandmann@...mi.au.dk, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Identify which executable object the userspace address
	belongs to. Store thread group leader id, and use it to lookup the
	address in the process's map. We could have looked up the address
	on thread's map, but the thread might not exist by the time we are
	called. The process might not exist either, but if you are reading
	trace_pipe, that is unlikely.

On Sun, Nov 02, 2008 at 11:18:14PM +0200, T??r??k Edwin wrote:
> +static int
> +trace_seq_path(struct trace_seq *s, struct path *path)
> +{
> +	int ret;
> +	struct seq_file m;
> +	m.count = s->len;
> +	m.size = PAGE_SIZE;
> +	m.buf = s->buffer;
> +	ret = seq_path(&m, path, "\n");
> +	if (ret)
> +		s->len = m.count;
> +	return ret;
> +}

NAK.  seq_path() is a blatantly wrong thing to use here.
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