linux-kernel - Re: [PATCH 3/3] uprobes: write_opcode()->__replace_page() can race with try_to

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Message-ID: <20120616071143.GA15962@gmail.com>
Date:	Sat, 16 Jun 2012 09:11:43 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Hugh Dickins <hughd@...gle.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <anton@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] uprobes: write_opcode()->__replace_page() can race
 with try_to_unmap()


* Oleg Nesterov <oleg@...hat.com> wrote:

> On 06/15, Ingo Molnar wrote:
> >
> > * Srikar Dronamraju <srikar@...ux.vnet.ibm.com> wrote:
> >
> > > > @@ -228,9 +210,10 @@ static int write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm,
> > > >  	void *vaddr_old, *vaddr_new;
> > > >  	struct vm_area_struct *vma;
> > > >  	struct uprobe *uprobe;
> > > > +	unsigned long pgoff;
> > > >  	loff_t addr;
> > > >  	int ret;
> > > > -
> > > > +retry:
> > >
> > > Just a check on coding style: Shouldnt we have a preceeding blank
> > > line before the goto label.
> >
> > Yeah, that's most likely helpful to readability.
> 
> Aaah. Srikar, sorry, I didn't notice this comment and I already
> sent 1-15. But I added the blank line in 2/15 ;)
> 
> Ingo, please let me know if I need to re-diff and resend. 
> Otherwise I'll add the blank line later, write_opcode() needs 
> more changes anyway.

No need, I've added it before I committed the patch.

Thanks,

	Ingo
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