linux-kernel - Re: Bug: fio traps into kernel without exiting because futex has a deadloop

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Message-ID: <alpine.LFD.2.00.0906150954540.2800@localhost.localdomain>
Date:	Mon, 15 Jun 2009 09:57:57 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
cc:	Peter Zijlstra <peterz@...radead.org>,
	Darren Hart <dvhltc@...ibm.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Bug: fio traps into kernel without exiting because futex has a
 deadloop

On Mon, 15 Jun 2009, Zhang, Yanmin wrote:
> > +	ret = get_user_pages_fast(addr, 1, 1, &page);
>
> I checked function get_user_pages_fast. It might return negative, 0, or
> positive value. 0 means it doesn't pin any page. So why does below statement
> use (!ret) to put_page?

Hmm, darn. You are right. It needs to be (ret > 0)

Thanks,

	tglx