linux-kernel - Re: [PATCH] Linux Kernel Markers 0.13 for 2.6.17

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Date:	Mon, 25 Sep 2006 17:06:55 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Mathieu Desnoyers <compudj@...stal.dyndns.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>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	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>,
	Karim Yaghmour <karim@...rsys.com>,
	Pavel Machek <pavel@...e.cz>, Joe Perches <joe@...ches.com>,
	"Randy.Dunlap" <rdunlap@...otime.net>,
	"Jose R. Santos" <jrs@...ibm.com>
Subject: Re: [PATCH] Linux Kernel Markers 0.13 for 2.6.17

Mathieu Desnoyers wrote:
> +/* Note : max 256 bytes between over_label and near_jump */
> +#define MARK_JUMP(name, format, args...) \
> +	do { \
> +		asm volatile(	".section .markers, \"a\";\n\t" \
> +				".long 0f, 1f, 2f;\n\t" \
> +				".previous;\n\t" \
> +				".align 16;\n\t" \
> +				".byte 0xeb;\n\t" \
> +				"0:\n\t" \
> +				".byte 2f-1f;\n\t" \
> +				"1:\n\t" \
> +			: "+m" (__marker_sequencer) : ); \
> +		MARK_CALL(name, format, ## args); \
> +		asm volatile (	"2:\n\t" : "+m" (__marker_sequencer) : ); \
>   

Unfortunately this doesn't work either.  The two asms are ordered with 
respect to each other, but there's nothing to 1) stop the MARK_CALL from 
being moved out between them, 2) something else being moved in between 
them.  I don't really see a way out of this without implementing the 
whole call in assembler as well, which is a big pain.

    J
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