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

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Date:	Tue, 5 Mar 2013 14:18:13 +0100
From:	Anton Arapov <anton@...hat.com>
To:	Ananth N Mavinakayanahalli <ananth@...ibm.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 Tue, Mar 05, 2013 at 12:33:26PM +0530, Ananth N Mavinakayanahalli wrote:
> 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.
perhaps, which in turn is a helper for user_stack_pointer() :) comment
is valid though.

thanks,
Anton.
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