linux-kernel - Re: [PATCH] Trace: initialize variable to clear warning

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Date:	Tue, 28 Feb 2012 11:27:03 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Zhengwang Ruan <ruan.zhengwang@...il.com>
Cc:	rostedt@...dmis.org, fweisbec@...il.com, mingo@...hat.com,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] Trace: initialize variable to clear warning

On Tue, Feb 28, 2012 at 05:09:34PM +0800, Zhengwang Ruan wrote:
> GCC warns that 'page2' is used without being initialized previously before
> being used, this is to clear it.
> 
> Signed-off-by: Zhengwang Ruan <ruan.zhengwang@...il.com>
> ---
>  kernel/trace/trace.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index a3f1bc5..47376ba 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -3694,7 +3694,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
>  	int nr_pages = 1;
>  	ssize_t written;
>  	void *page1;
> -	void *page2;
> +	void *uninitialized_var(page2);
>  	int offset;
>  	int size;
>  	int len;

We had this already - gcc 4.5 warns incorrectly about this, you should
upgrade to 4.6: http://marc.info/?l=linux-kernel&m=132083844427859

-- 
Regards/Gruss,
Boris.
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