linux-kernel - Re: [Patch] Fix shadowed variables in fs/binfmt

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Date:	Sat, 16 Feb 2008 16:50:24 +0800 (CST)
From:	WANG Cong <xiyou.wangcong@...il.com>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [Patch] Fix shadowed variables in fs/binfmt_elf.c

From: Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Patch] Fix shadowed variables in fs/binfmt_elf.c
Date: Fri, 15 Feb 2008 12:34:59 -0800
Message-ID: <20080215123459.0a675826.akpm@...ux-foundation.org>

> On Fri, 15 Feb 2008 21:58:02 +0800 (CST)
> WANG Cong <xiyou.wangcong@...il.com> wrote:
> 
> > 
> > Fix these sparse warings:
> > fs/binfmt_elf.c:1749:29: warning: symbol 'tmp' shadows an earlier one
> > fs/binfmt_elf.c:1734:28: originally declared here
> > fs/binfmt_elf.c:2009:26: warning: symbol 'vma' shadows an earlier one
> > fs/binfmt_elf.c:1892:24: originally declared here
> > 
> > Signed-off-by: WANG Cong <xiyou.wangcong@...il.com>
> > 
> > ---
> > diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
> > index 41a958a..6562563 100644
> > --- a/fs/binfmt_elf.c
> > +++ b/fs/binfmt_elf.c
> > @@ -1746,11 +1746,11 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
> >  		while_each_thread(g, p);
> >  		rcu_read_unlock();
> >  		list_for_each(t, &info->thread_list) {
> > -			struct elf_thread_status *tmp;
> > +			struct elf_thread_status *temp;
> >  			int sz;
> >  
> > -			tmp = list_entry(t, struct elf_thread_status, list);
> > -			sz = elf_dump_thread_status(signr, tmp);
> > +			temp = list_entry(t, struct elf_thread_status, list);
> > +			sz = elf_dump_thread_status(signr, temp);
> >  			info->thread_status_size += sz;
> >  		}
> >  	}
> 
> `tmp' is an awful identifier, and renaming it to "temp" hardly improves it.
> Please take any opportunity to fix this sort of thing.
> 
> I chose "ets" which is a bit weird but once one understand what it means,
> it makes the code much easier to follow.
> 
> Also used the same local for both loops.  There seems little point in
> instantiating a second one.

I agree. The first 'tmp' you showed is really not good, 'ets' is better.

Thanks, Andrew!
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