linux-kernel - Re: [PATCH] uprobes: Add uprobe_task->dup_work/dup

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Message-ID: <20131112174302.GH2559@linux.vnet.ibm.com>
Date:	Tue, 12 Nov 2013 23:13:02 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] uprobes: Add uprobe_task->dup_work/dup_addr

> Yes, and it is always equal to regs->ip when pre_ssout() is called,
> 
> > and do the necessary fixups after single stepping out of line.
> 
> Exactly. So it is write-only (and meaningless) to the generic uprobe
> code. We can (and perhaps should) move it into autask->saved_vaddr,
> arch_uprobe_pre_xol() can initialize it.
> 
> > The casual reading of this commit message, one can get an impression
> > that vaddr is never needed.
> 
> See above. The changelog doesn't say we can simply remove it, it says
> "move it".


Okay, moving to arch_uprobe_task is fine. I probably got confused by 
"First of all it is not really needed," 
> 
> > Your change still retains it.
> 
> 
> OK. How about dup_xol_work/dup_xol_vaddr ?
> 

Yes fine with me.

-- 
Thanks and Regards
Srikar Dronamraju

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