linux-kernel - Re: 2.6.31.4-rt14 posix message queues problem (solved)

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Date:	Fri, 16 Oct 2009 10:09:46 +0200
From:	Joerg Abraham <Joerg.Abraham@...atel-lucent.de>
To:	John Kacur <jkacur@...hat.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.31.4-rt14 posix message queues problem (solved)

Hi John,

> Hello Joerg
> 
> Does the following patch solve your problem? 

yes, (verified on powerpc and x86_64)

so it may be save to include your patch into the next rt release.

Thanx,

Joerg


> 
> From 69fde4357db4a054733cbca4158606160e821a3a Mon Sep 17 00:00:00 2001
> From: John Kacur <jkacur@...hat.com>
> Date: Thu, 15 Oct 2009 20:52:37 +0200
> Subject: [PATCH] preempt_disable_rt(); should be paired with preempt_enable_rt()
> 
> Signed-off-by: John Kacur <jkacur@...hat.com>
> ---
>  ipc/mqueue.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/ipc/mqueue.c b/ipc/mqueue.c
> index 63a47f7..ab4df36 100644
> --- a/ipc/mqueue.c
> +++ b/ipc/mqueue.c
> @@ -830,7 +830,7 @@ static inline void pipelined_send(struct mqueue_inode_info *info,
>  	wake_up_process(receiver->task);
>  	smp_wmb();
>  	receiver->state = STATE_READY;
> -	preempt_enable_nort();
> +	preempt_enable_rt();
>  }
>  
>  /* pipelined_receive() - if there is task waiting in sys_mq_timedsend()

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