linux-kernel - Re: [PATCH] tracing/stack-tracer: avoid races accessing file

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Message-ID: <20081123112043.GA29663@elte.hu>
Date:	Sun, 23 Nov 2008 12:20:43 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Török Edwin <edwintorok@...il.com>
Cc:	srostedt@...hat.com, a.p.zijlstra@...llo.nl, sandmann@...mi.au.dk,
	linux-kernel@...r.kernel.org, viro@...IV.linux.org.uk
Subject: Re: [PATCH] tracing/stack-tracer: avoid races accessing file


* Török Edwin <edwintorok@...il.com> wrote:

> ---
>  kernel/trace/trace.c |   10 +++++-----
>  1 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index 4c3bd82..48d1536 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -1470,13 +1470,13 @@ static inline int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
>  			file = vma->vm_file;
>  			vmstart = vma->vm_start;
>  		}
> +		if (file) {
> +			ret = trace_seq_path(s, &file->f_path);
> +			if (ret)
> +				ret = trace_seq_printf(s, "[+0x%lx]", ip - vmstart);
> +		}
>  		up_read(&mm->mmap_sem);
>  	}
> -	if (file) {
> -		ret = trace_seq_path(s, &file->f_path);
> -		if (ret)
> -			ret = trace_seq_printf(s, "[+0x%lx]", ip - vmstart);
> -	}

applied to tip/tracing/stack-tracer, thanks Edwin!

	Ingo
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