linux-kernel - Re: [GIT pull] timer updates for 3.4-rc

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Message-ID: <alpine.DEB.2.00.1204061636260.32765@chino.kir.corp.google.com>
Date:	Fri, 6 Apr 2012 16:37:55 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Thomas Gleixner <tglx@...utronix.de>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [GIT pull] timer updates for 3.4-rc

On Sat, 7 Apr 2012, Thomas Gleixner wrote:

> diff --git a/kernel/itimer.c b/kernel/itimer.c
> index 22000c3..c70369a 100644
> --- a/kernel/itimer.c
> +++ b/kernel/itimer.c
> @@ -284,8 +284,11 @@ SYSCALL_DEFINE3(setitimer, int, which, struct itimerval __user *, value,
>  	if (value) {
>  		if(copy_from_user(&set_buffer, value, sizeof(set_buffer)))
>  			return -EFAULT;
> -	} else
> +	} else {
>  		memset((char *) &set_buffer, 0, sizeof(set_buffer));
> +		WARN_ONCE(1, "setitimer: new_value pointer is NULL."
> +			  " Misfeature support will be removed\n");
> +	}
>  
>  	error = do_setitimer(which, &set_buffer, ovalue ? &get_buffer : NULL);
>  	if (error || !ovalue)

When I tried doing this for the deprecated /proc/pid/oom_adj there was a 
complaint that WARN_ONCE() screws up log parsing scripts that think there 
is a kernel issue so I had to change it to printk_once() and include 
get_task_comm(current) and current->pid.  See
http://lkml.indiana.edu/hypermail/linux/kernel/1108.0/00446.html
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