linux-kernel - Re: [RFC patch 07/18] Trace clock core

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Message-Id: <20081107081939.4bcdf25b.akpm@linux-foundation.org>
Date:	Fri, 7 Nov 2008 08:19:39 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, Nicolas Pitre <nico@....org>,
	Ralf Baechle <ralf@...ux-mips.org>, benh@...nel.crashing.org,
	paulus@...ba.org, David Miller <davem@...emloft.net>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-arch@...r.kernel.org
Subject: Re: [RFC patch 07/18] Trace clock core

On Fri, 7 Nov 2008 11:12:38 -0500 Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:

> * Andrew Morton (akpm@...ux-foundation.org) wrote:
> > On Fri, 7 Nov 2008 01:16:43 -0500 Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:
> > 
> > > > Is there something we should be fixing in m68k?
> > > > 
> > > 
> > > Yes, but I fear it's going to go deep into include hell :-(
> > 
> > Oh, OK.  I thought that the comment meant that m68k's on_each_cpu()
> > behaves differently at runtime from other architectures (and wrongly).
> > 
> > If it's just some compile-time #include snafu then that's far less
> > of a concern.
> > 
> 
> Should I simply remove this comment then ?
> 

umm, it could perhaps be clarified - mention that it's needed for an
include order problem.

It's a bit odd.  Surely by the time we've included these:

+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/workqueue.h>
+#include <linux/cpu.h>
+#include <linux/timex.h>
+#include <linux/bitops.h>
+#include <linux/trace-clock.h>
+#include <linux/smp.h>

someone has already included sched.h, and the definition of
_LINUX_SCHED_H will cause the later inclusion to not change anything?

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