linux-kernel - Re: [RFC PATCH v2 4/4] uretprobes: invoke return probe handlers

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Message-ID: <20130109162842.GD27722@redhat.com>
Date:	Wed, 9 Jan 2013 17:28:42 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Anton Arapov <anton@...hat.com>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Josh Stone <jistone@...hat.com>,
	Frank Eigler <fche@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>
Subject: Re: [RFC PATCH v2 4/4] uretprobes: invoke return probe handlers

On 01/09, Anton Arapov wrote:
>
>  static void handle_swbp(struct pt_regs *regs)
>  {
>  	struct uprobe *uprobe;
> +	struct xol_area *area;
>  	unsigned long bp_vaddr;
>  	int uninitialized_var(is_swbp);
>  
>  	bp_vaddr = uprobe_get_swbp_addr(regs);
> -	uprobe = find_active_uprobe(bp_vaddr, &is_swbp);
> +	area = get_xol_area();

No, we do not need to allocate xol area here.

> +	if (area) {
> +		if (bp_vaddr == area->vaddr) {
> +			handle_rp_swbp(regs);

Can't understand... this should check bp_vaddr == rp_trampoline_vaddr ?

Again, unless you remove rp_trampoline_vaddr altogether.

Oleg.

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