linux-kernel - Re: [PATCH] tty/serial: Fix uninitialized variable warning

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Date:	Fri, 15 Mar 2013 21:24:38 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tty/serial: Fix uninitialized variable warning

On Fri, Mar 15, 2013 at 8:30 PM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> On Mon, Mar 04, 2013 at 09:35:07AM +0800, Grant Likely wrote:
>> drivers/tty/serial/8250/8250.c: In function 'serial_unlink_irq_chain':
>> drivers/tty/serial/8250/8250.c:1676:19: warning: 'i' may be used uninitialized in this function
>>
>> There isn't an actual bug here since the function tests the condition
>> that would cause i to be uninitialized before dereferencing i. However,
>> at least some versions of GCC complain as shown above. (in my case,
>> powerpc gcc 2.5.2). Initializing i to NULL makes it clear to GCC and the
>> casual code reviewer that i will not be dereferenced to a random
>> address.
>>
>> Signed-off-by: Grant Likely <grant.likely@...retlab.ca>
>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>> ---
>> Greg, some may argue that this is a tool problem, not a kernel problem,
>> but it is useful to me. If anyone objects I'm not going to spend any
>> time championing for this patch.
>
> Upgrade your tools to ones that work properly :)

FWIW, it's still a toolchain that a lot of people use for embedded
powerpc development.

g.
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