linux-kernel - Re: [PATCH] Linux Kernel Markers 0.7 for 2.6.17 (with type checking!)

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Message-ID: <20060922023828.GA10291@Krystal>
Date:	Thu, 21 Sep 2006 22:38:28 -0400
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Martin Bligh <mbligh@...gle.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	prasanna@...ibm.com, Andrew Morton <akpm@...l.org>,
	Ingo Molnar <mingo@...e.hu>, Paul Mundt <lethal@...ux-sh.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Jes Sorensen <jes@....com>, Tom Zanussi <zanussi@...ibm.com>,
	Richard J Moore <richardj_moore@...ibm.com>,
	Michel Dagenais <michel.dagenais@...ymtl.ca>,
	Christoph Hellwig <hch@...radead.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	William Cohen <wcohen@...hat.com>, ltt-dev@...fik.org,
	systemtap@...rces.redhat.com, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] Linux Kernel Markers 0.7 for 2.6.17 (with type checking!)

* Jeremy Fitzhardinge (jeremy@...p.org) wrote:
> Mathieu Desnoyers wrote:
> >#define MARK_SYM(name) \
> >        do { \
> >                __label__ here; \
> >                volatile static void *__mark_kprobe_##name \
> >                        asm (MARK_CALL_PREFIX#name) \
> >                        __attribute__((unused)) = &&here; \
> >here: \
> >                do { } while(0); \
> >        } while(0)
> >
> >Which fixes the problem. Some tests showed me that the compiler does not 
> >unroll
> >an otherwise unrolled loop when this specific macro is called. (test done 
> >with
> >-funroll-all-loops).
> 
> Eh?  I thought you wanted to avoid changing the generated code?  
> Inhibiting loop unrolling could be a pretty large change...
> 

>From what I see in 2.6.17/2.6.18 makefiles, only -OS and -O2 are generally 
used by the build system (no -O3) and there is not use of -funroll-loops. I
guess it must not be so useful in this context.

Mathieu


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