linux-kernel - Re: [PATCH 2/2 v2] tracing/syscalls: support for syscalls tracing on x86-64

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Message-Id: <20090314205306.cafe25c6.akpm@linux-foundation.org>
Date:	Sat, 14 Mar 2009 20:53:06 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>, tglx@...utronix.de,
	Jason Baron <jbaron@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Michael Rubin <mrubin@...gle.com>,
	Martin Bligh <mbligh@...gle.com>,
	Michael Davidson <md@...gle.com>
Subject: Re: [PATCH 2/2 v2] tracing/syscalls: support for syscalls tracing
 on x86-64

On Fri, 13 Mar 2009 15:42:12 +0100 Frederic Weisbecker <fweisbec@...il.com> wrote:

> +static struct syscall_metadata *find_syscall_meta(unsigned long *syscall)
> +{
> +	struct syscall_metadata *start;
> +	struct syscall_metadata *stop;
> +	char str[KSYM_SYMBOL_LEN];
> +
> +
> +	start = (struct syscall_metadata *)__start_syscalls_metadata;
> +	stop = (struct syscall_metadata *)__stop_syscalls_metadata;
> +	kallsyms_lookup((unsigned long) syscall, NULL, NULL, NULL, str);
> +
> +	for ( ; start < stop; start++) {
> +		if (start->name && !strcmp(start->name, str))
> +			return start;
> +	}
> +	return NULL;
> +}

afacit this feature can be enabled when CONFIG_KALLSYMS=n.  Does that make
sense?

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