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Date: Wed, 20 Sep 2006 15:58:01 -0400 From: Karim Yaghmour <karim@...rsys.com> To: Martin Bligh <mbligh@...gle.com> CC: "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>, Michael Davidson <md@...gle.com> Subject: Re: [PATCH] Linux Kernel Markers Martin Bligh wrote: > You mean using the jump-over thing that was posted earlier? > I thought the CPU erratas prevented doing that atomically > properly. From my understanding of the last 24 hours discussion, > it seemed like the ONLY thing we could do safely atomically was > insert an int3. Which sucks, frankly, but still. No. djprobes already does safely insert other stuff than just int3, that's the whole point. Here are the relevant postings by Hiramatsu-san: http://marc.theaimsgroup.com/?l=linux-kernel&m=115875912510827&w=2 http://marc.theaimsgroup.com/?l=linux-kernel&m=115875867519302&w=2 Unless there's something *I* fundamentally misunderstood from Hiramatsu-san's implementation and input, djprobes can replace the 5-byte filler with a 5-byte unconditional jump. IOW your mechanism works, no int3s involved. Karim - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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