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

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Message-ID: <20120615154810.GA9662@redhat.com>
Date:	Fri, 15 Jun 2012 17:48:10 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
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()

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.

Oleg.

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