linux-kernel - Re: [PATCH] 8250: Eliminate compile warning of 8250.c

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Message-ID: <20081125111213.GA6698@dspnet.fr.eu.org>
Date:	Tue, 25 Nov 2008 12:12:13 +0100
From:	Olivier Galibert <galibert@...ox.com>
To:	Sheng Yang <sheng@...ux.intel.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH] 8250: Eliminate compile warning of 8250.c

On Tue, Nov 25, 2008 at 06:51:44PM +0800, Sheng Yang wrote:
> The logic here is strange...
> 
> If you used old compiler, you would get a warning, and you thought that's 
> ensured we won't delete a intended assignment by mistake.
> 
> If you used new compiler, you wouldn't get a warning, and you think this time 
> the compiler get it right.

The new compiler gets it right.  If you delete the assignment with the
new compiler, *then* you get a warning.


> OK. if you worry about "delete a line which does the intended assignment", the 
> updated version with BUG_ON(i == NULL) can help. 

Compile-time error detection is better than runtime.

  OG.
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