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Message-ID: <4CE4BE8E.8060509@cn.fujitsu.com>
Date: Thu, 18 Nov 2010 13:50:06 +0800
From: Lai Jiangshan <laijs@...fujitsu.com>
To: Steven Rostedt <rostedt@...dmis.org>
CC: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
Andrew Morton <akpm@...ux-foundation.org>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
Frederic Weisbecker <fweisbec@...il.com>,
Darren Hart <dvhart@...ux.intel.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
"jason.wessel" <jason.wessel@...driver.com>,
"Ted Ts'o" <tytso@....edu>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [RFC][PATCH 2/2] [PATCH 2/2] tracing: Make event based trace_printk()
On 11/18/2010 11:58 AM, Steven Rostedt wrote:
> +#define trace_printk(fmt, args...) \
> + do { \
> + static struct event_printk_struct \
> + __attribute__((__aligned__(4))) \
> + __attribute__((section("_trace_printk"))) \
> + ______t = { \
> + .format = fmt, \
if fmt is not constant, the compiler will complain...
> + .func = __func__, \
> + .file = __FILE__, \
> + .line = __LINE__, \
> + }; \
> + __trace_printk_check_format(fmt, ##args); \
> + if (!__builtin_constant_p(fmt)) \
> + trace_printk_can_only_have_constant_format(); \
so this is not need.
> + if (unlikely(__event_printk_test(&______t.enable))) \
> + __trace_bprintk(_THIS_IP_, fmt, ##args); \
> + } while (0)
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