linux-kernel - Re: lockdep: testing '0' where '\0' intended?

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Date:	Sat, 12 Oct 2013 16:40:57 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Roel Kluin <roel.kluin@...il.com>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: lockdep: testing '0' where '\0' intended?

On Sat, Oct 12, 2013 at 01:06:03AM +0200, Roel Kluin wrote:
> Not entirely sure about the assembly part, but shouldn't it...
> --------
> Test for the nul character rather than the '0' (== 0x30), in the
> __get_user_unknown() case.
> 
> Signed-off-by: Roel Kluin <roel.kluin@...il.com>
> ---
> diff --git a/kernel/lockdep_proc.c b/kernel/lockdep_proc.c
> index b2c71c5..71b3aba 100644
> --- a/kernel/lockdep_proc.c
> +++ b/kernel/lockdep_proc.c
> @@ -632,7 +632,7 @@ static ssize_t lock_stat_write(struct file *file, 
> const char __user *buf,
>  		if (get_user(c, buf))
>  			return -EFAULT;
>  
> -		if (c != '0')
> +		if (c != '\0')

No we really meant '0'. Its so that:

  echo 0 > /proc/lock_stat

resets the stats.
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