linux-kernel - Re: [PATCH v9 3.2 2/9] uprobes: handle breakpoint and signal step exception.

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Date:	Wed, 25 Jan 2012 13:42:23 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Mike Frysinger <vapier@...too.org>
Cc:	Anton Arapov <anton@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-mm <linux-mm@...ck.org>, Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Roland McGrath <roland@...k.frob.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH v9 3.2 2/9] uprobes: handle breakpoint and signal step
 exception.

> >>
> >> One question that could be asked is why arent we using instruction_pointer
> >> instead of GET_IP since instruction_pointer is being defined in 25
> >> places and with references in 120 places.
> >
> > i think you misunderstand the point.  {G,S}ET_IP() is the glue between the
> > arch's pt_regs struct and the public facing API.  the only people who should
> > be touching those macros are the ptrace core.  instruction_pointer() and
> > instruction_pointer_set() are the API that asm/ptrace.h exports to the rest of
> > the tree.
> 
> Srikar: does that make sense ?  i'm happy to help with improving
> asm-generic/ptrace.h.
> -mike
> 

Yes, I think it makes sense. I have modified the code to use
instruction_pointer_set instead of set_instruction_pointer.

-- 
Thanks and Regards
Srikar

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