linux-kernel - Re: [PATCH] tracing: Fix undelared ENOSYS in include/linux/tracepoint.h

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Message-ID: <20100621154712.GB6965@Krystal>
Date:	Mon, 21 Jun 2010 11:47:12 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Wu Zhangjin <wuzhangjin@...il.com>, linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: Re: [PATCH] tracing: Fix undelared ENOSYS in
	include/linux/tracepoint.h

* Steven Rostedt (rostedt@...dmis.org) wrote:
> On Mon, 2010-06-21 at 19:09 +0800, Wu Zhangjin wrote:
> > From: Wu Zhangjin <wuzhangjin@...il.com>
> > 
> > The header file include/linux/tracepoint.h may be included without
> > include/linux/errno.h and then the compiler will fail on building for
> > undelcared ENOSYS. This patch fixes this problem via including <linux/errno.h>
> > to include/linux/tracepoint.h.
> > 
> 
> Hi Wu,
> 
> I have not hit this. Did you hit this with mips? Does it need to get
> into 2.6.35 or can it wait till 2.6.36?

errno.h is included by sched.h, which is included almost everywhere. No
wonder it took that much time for someone to hit the problem. But given
it's a simple bug fix, it should fit into the "for-2.6.35" definition,
although I am no expert in these definitions. ;-)

Thanks,

Mathieu

> 
> -- Steve
> 
> > Signed-off-by: Wu Zhangjin <wuzhangjin@...il.com>
> > ---
> >  include/linux/tracepoint.h |    1 +
> >  1 files changed, 1 insertions(+), 0 deletions(-)
> > 
> > diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
> > index 9a59d1f..103d1b6 100644
> > --- a/include/linux/tracepoint.h
> > +++ b/include/linux/tracepoint.h
> > @@ -14,6 +14,7 @@
> >   * See the file COPYING for more details.
> >   */
> >  
> > +#include <linux/errno.h>
> >  #include <linux/types.h>
> >  #include <linux/rcupdate.h>
> >  
> 
> 

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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