linux-kernel - Re: [PATCH 1/2 v2] tracing/syscalls: core infrastructure for syscalls tracing

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Date:	Mon, 6 Apr 2009 14:55:55 -0700
From:	Tony Luck <tony.luck@...el.com>
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 1/2 v2] tracing/syscalls: core infrastructure for syscalls 
	tracing

On Fri, Mar 13, 2009 at 7:42 AM, Frederic Weisbecker <fweisbec@...il.com> wrote:
> diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
> index ab1d772..dfe2a44 100644
> --- a/include/linux/syscalls.h
> +++ b/include/linux/syscalls.h
> @@ -66,6 +66,7 @@ struct perf_counter_hw_event;
>  #include <asm/signal.h>
>  #include <linux/quota.h>
>  #include <linux/key.h>
> +#include <linux/ftrace.h>

This causes some unpleasantness in the ia64 build with CONFIG_IA32_SUPPORT=y

  CC      arch/ia64/ia32/sys_ia32.o
In file included from arch/ia64/ia32/sys_ia32.c:55:
arch/ia64/ia32/ia32priv.h:290:1: warning: "elf_check_arch" redefined
In file included from include/linux/elf.h:7,
                 from include/linux/module.h:14,
                 from include/linux/ftrace.h:8,
                 from include/linux/syscalls.h:68,
                 from arch/ia64/ia32/sys_ia32.c:18:
/home/aegl/generic-smp/arch/ia64/include/asm/elf.h:19:1: warning: this
is the location of the previous definition
In file included from arch/ia64/ia32/sys_ia32.c:55:
arch/ia64/ia32/ia32priv.h:295:1: warning: "ELF_CLASS" redefined
In file included from include/linux/elf.h:7,
                 from include/linux/module.h:14,
                 from include/linux/ftrace.h:8,
                 from include/linux/syscalls.h:68,
                 from arch/ia64/ia32/sys_ia32.c:18:

and lots more like this.  Suddenly having elf.h included in a lot of
the ia32 compat
files is the root problem.

What does syscalls.h really need to pull in at this point ... is there
a way for it to get it without pulling in so much extra stuff?

-Tony
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