linux-kernel - Re: [PATCH v1 1/10] Move Macro W to insn.h

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Message-ID: <20100322062450.GD30463@linux.vnet.ibm.com>
Date:	Mon, 22 Mar 2010 11:54:50 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/10] Move Macro W to insn.h

* Masami Hiramatsu <mhiramat@...hat.com> [2010-03-20 11:50:06]:

> Srikar Dronamraju wrote:
> > Move Macro W to asm/insn.h
> > 
> > Macro W used to know if the instructions are valid for
> > user-space/kernel space.  This macro is used by kprobes and
> > user_bkpt. (i.e user space breakpoint assistance layer.) So moving it
> > to a common header file asm/insn.h.
> 
> Hmm, I don't think this shortest macro name is good to expose
> commonly... And also, since we already have inat (instruction
> attribute) table, we'd better expand an inat bit to indicate
> which instruction can be probed/boosted.
> 

Guess we would need three bits, 
- Instruction can be probed in kernel.
- Instruction can be probed in user space.
- Instruction can be boosted.

Or do you have other ideas?

--
Thanks and Regards
Srikar
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