linux-kernel - Re: [RFC PATCH v4 5/6] uretprobes: invoke return probe handlers

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Message-ID: <20130305070326.GA5684@in.ibm.com>
Date:	Tue, 5 Mar 2013 12:33:26 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Anton Arapov <anton@...hat.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	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>
Subject: Re: [RFC PATCH v4 5/6] uretprobes: invoke return probe handlers

On Mon, Mar 04, 2013 at 03:38:12PM +0100, Anton Arapov wrote:
> 
> diff --git a/arch/x86/include/asm/uprobes.h b/arch/x86/include/asm/uprobes.h
> index c353555..fa9d9de 100644
> --- a/arch/x86/include/asm/uprobes.h
> +++ b/arch/x86/include/asm/uprobes.h
> @@ -56,4 +56,9 @@ extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk);
>  extern int  arch_uprobe_exception_notify(struct notifier_block *self, unsigned long val, void *data);
>  extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, struct pt_regs *regs);
>  extern unsigned long arch_uretprobe_hijack_return_addr(unsigned long rp_trampoline_vaddr, struct pt_regs *regs);
> +
> +static inline unsigned long arch_uretprobe_get_sp(struct pt_regs *regs)
> +{
> +	return (unsigned long)regs->sp;
> +}

You could use GET_USP() here.

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