linux-kernel - Re: [PATCH 2/7] uretprobes: extract fill_page() and trampoline implementation

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Message-ID: <20130325115820.GA27398@redhat.com>
Date:	Mon, 25 Mar 2013 12:58:20 +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 2/7] uretprobes: extract fill_page() and trampoline
	implementation

On 03/24, Oleg Nesterov wrote:
>
> On 03/22, Anton Arapov wrote:
> >
> > @@ -1139,6 +1155,10 @@ static struct xol_area *get_xol_area(void)
> >  	if (!area->page)
> >  		goto free_bitmap;
> >
> > +	/* pre-allocate for return probes */
> > +	set_bit(0, area->bitmap);
> > +	fill_page(area->page, 0, &insn);
>
> sizeof(insn) == UPROBE_SWBP_INSN_SIZE != MAX_UINSN_BYTES. See also the
> comments above.

Sorry, forgot to mention... you also need to update ->slot_count.

Oleg.

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