linux-kernel - Re: [PATCH 7/7] uprobes: Kill the bogus IS_ERR_VALUE(xol

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Message-ID: <20130108122347.GJ1325@linux.vnet.ibm.com>
Date:	Tue, 8 Jan 2013 17:53:47 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <anton@...hat.com>,
	Frank Eigler <fche@...hat.com>,
	Josh Stone <jistone@...hat.com>,
	"Suzuki K. Poulose" <suzuki@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] uprobes: Kill the bogus IS_ERR_VALUE(xol_vaddr)
 check

* Oleg Nesterov <oleg@...hat.com> [2012-12-31 18:52:32]:

> utask->xol_vaddr is either zero or valid, remove the bogus
> IS_ERR_VALUE() check in xol_free_insn_slot().
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Acked-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>

> ---
>  kernel/events/uprobes.c |    3 +--
>  1 files changed, 1 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
> index ad1245d..ed4fcbe 100644
> --- a/kernel/events/uprobes.c
> +++ b/kernel/events/uprobes.c
> @@ -1223,8 +1223,7 @@ static void xol_free_insn_slot(struct task_struct *tsk)
>  		return;
> 
>  	slot_addr = tsk->utask->xol_vaddr;
> -
> -	if (unlikely(!slot_addr || IS_ERR_VALUE(slot_addr)))
> +	if (unlikely(!slot_addr))
>  		return;
> 
>  	area = tsk->mm->uprobes_state.xol_area;
> -- 
> 1.5.5.1
> 

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