linux-kernel - Re: [PATCH] mm/vmalloc.c: fix sparse warning

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Date:	Thu, 23 Apr 2009 13:23:58 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"H Hartley Sweeten" <hartleys@...ionengravers.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/vmalloc.c: fix sparse warning

On Fri, 17 Apr 2009 20:55:06 -0400
"H Hartley Sweeten" <hartleys@...ionengravers.com> wrote:

> Fix sparse warning in mm/vmalloc.c.
> 
>   warning: symbol 'tmp' shadows an earlier one
> 
> Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
> 
> ---
> 
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index fab1987..4959a30 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -292,13 +292,13 @@ static void __insert_vmap_area(struct vmap_area
> *va)
>  	struct rb_node *tmp;
>  
>  	while (*p) {
> -		struct vmap_area *tmp;
> +		struct vmap_area *tmp_va;
>  
>  		parent = *p;
> -		tmp = rb_entry(parent, struct vmap_area, rb_node);
> -		if (va->va_start < tmp->va_end)
> +		tmp_va = rb_entry(parent, struct vmap_area, rb_node);
> +		if (va->va_start < tmp_va->va_end)
>  			p = &(*p)->rb_left;
> -		else if (va->va_end > tmp->va_start)
> +		else if (va->va_end > tmp_va->va_start)
>  			p = &(*p)->rb_right;
>  		else
>  			BUG(); 

It would be sufficient to simply delete the inner definition of `tmp'.

Use of a variable called "tmp" is often bad - it's almost always a
result of plain old laziness and the code can be improved by using a
more meaningful identifier.

But in this case the code is sufficiently short and simple that I guess
we can live with "tmp".

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