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Date: Thu, 25 Sep 2008 17:01:11 -0400 (EDT)
From: Steven Rostedt <rostedt@goodmis.org>
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To: Linus Torvalds <torvalds@linux-foundation.org>
cc: Ingo Molnar <mingo@elte.hu>, Martin Bligh <mbligh@google.com>,
       Peter Zijlstra <peterz@infradead.org>, Martin Bligh <mbligh@mbligh.org>,
       linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
       Andrew Morton <akpm@linux-foundation.org>, prasad@linux.vnet.ibm.com,
       Mathieu Desnoyers <compudj@krystal.dyndns.org>,
       "Frank Ch. Eigler" <fche@redhat.com>, David Wilder <dwilder@us.ibm.com>,
       hch@lst.de, Tom Zanussi <zanussi@comcast.net>,
       Steven Rostedt <srostedt@redhat.com>
Subject: Re: [RFC PATCH 1/3] Unified trace buffer
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On Thu, 25 Sep 2008, Linus Torvalds wrote:
> 
> CFLAGS_REMOVE_lockdep.o = -pg
> CFLAGS_REMOVE_lockdep_proc.o = -pg
> CFLAGS_REMOVE_mutex-debug.o = -pg
> CFLAGS_REMOVE_rtmutex-debug.o = -pg
> CFLAGS_REMOVE_cgroup-debug.o = -pg
> CFLAGS_REMOVE_sched_clock.o = -pg
> CFLAGS_REMOVE_sched.o = -mno-spe -pg
> 

You'll also find in the lib Makefile:

ifdef CONFIG_FTRACE
ORIG_CFLAGS := $(KBUILD_CFLAGS)
KBUILD_CFLAGS = $(subst -pg,,$(ORIG_CFLAGS))
endif

Which removes all -pg flags from all in the lib directory. The reason is 
that a lot of archs (well, I know PPC for sure) use these functions on 
early boot up, where simply calling mcount will produce a page fault.

-- Steve