linux-kernel - Re: [PATCH 4/5] uprobes: Kill UTASK_BP

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Message-ID: <20120916143822.GA20312@redhat.com>
Date:	Sun, 16 Sep 2012 16:38:22 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <anton@...hat.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] uprobes: Kill UTASK_BP_HIT state

On 09/14, Oleg Nesterov wrote:
>
> Kill UTASK_BP_HIT state, it buys nothing but complicates the code.
> It is only used in uprobe_notify_resume() to decide who should be
> called, we can check utask->active_uprobe != NULL instead. And this
> allows us to simplify handle_swbp(), no need to clear utask->state.

I am starting to think this patch makes even more sense than I thought.

> Likewise we could kill UTASK_SSTEP,

In fact we can kill utask->state. But I just realized we can also kill
uprobe_deny_signal() and simplify arch_uprobe_xol_was_trapped() logic.

But this needs some (simple) changes in arch/ code, so we need to wait
until powerpc is merged.

Oleg.

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