linux-kernel - Re: [PATCH 4/7] uretprobes: return probe entry, prepare

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Message-ID: <20130326143438.GA1065@redhat.com>
Date:	Tue, 26 Mar 2013 15:34:38 +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>,
	adrian.m.negreanu@...el.com, Torsten.Polle@....de
Subject: Re: [PATCH 4/7] uretprobes: return probe entry, prepare_uretprobe()

On 03/26, Anton Arapov wrote:
>
> On Fri, Mar 22, 2013 at 04:02:52PM +0100, Oleg Nesterov wrote:
> > > +	ri->dirty = false;
> > > +	trampoline_vaddr = get_trampoline_vaddr(area);
> > > +	ret_vaddr = arch_uretprobe_hijack_return_addr(trampoline_vaddr, regs);
> >
> > OK, but you need to ensure that this code can be compiled on poweprc.
>
> It does compile, unlike the obvious arch_uretprobe_hijack_return_addr() where
> I'll look for the Ananth's help, perhaps.

Just make the default weak function which returns -1.

After that Ananth can send the (hopefully simple) patch with the
powerpc implementation.

Oleg.

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