linux-kernel - Re: [PATCH] uprobes/core: handle breakpoint and signal step exception.

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Date:	Thu, 23 Feb 2012 13:18:05 +0100
From:	Anton Arapov <anton@...hat.com>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Jiri Olsa <jolsa@...hat.com>, Josh Stone <jistone@...hat.com>
Subject: Re: [PATCH] uprobes/core: handle breakpoint and signal step
 exception.

a super minor comment below.

On Thu, Feb 23, 2012 at 04:32:45PM +0530, Srikar Dronamraju wrote:
> From: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
> 
> Uprobes uses exception notifiers to get to know if a thread hit a
> breakpoint or singlestep exception.
> 
[snip]
> ---
>  arch/x86/include/asm/thread_info.h |    2 
>  arch/x86/include/asm/uprobes.h     |   16 ++
>  arch/x86/kernel/signal.c           |    6 +
>  arch/x86/kernel/uprobes.c          |  275 +++++++++++++++++++++++++++++++++++
>  include/linux/sched.h              |    4 +
>  include/linux/uprobes.h            |   44 ++++++
>  kernel/events/uprobes.c            |  279 ++++++++++++++++++++++++++++++++++++
>  kernel/fork.c                      |    7 +
>  kernel/signal.c                    |    6 +
>  9 files changed, 629 insertions(+), 10 deletions(-)
> 
[snip]

> +static void handler_chain(struct uprobe *uprobe, struct pt_regs *regs)
> +{
> +	struct uprobe_consumer *consumer;
> +
> +	if (!(uprobe->flags & UPROBES_RUN_HANDLER))
> +		return;
> +
> +	down_read(&uprobe->consumer_rwsem);
> +	consumer = uprobe->consumers;
The line above is not needed, looks like a leftover. Perhaps Ingo can
cut it before commit.

> +	for (consumer = uprobe->consumers; consumer; consumer = consumer->next) {
> +		if (!consumer->filter || consumer->filter(consumer, current))
> +			consumer->handler(consumer, regs);
> +	}
> +	up_read(&uprobe->consumer_rwsem);
> +}
> +
>  /* Returns the previous consumer */
>  static struct uprobe_consumer *
>  consumer_add(struct uprobe *uprobe, struct uprobe_consumer *consumer)
[snip]

Anton.
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