linux-kernel - Re: Sparse warning: "initializer entry defined twice"

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Date:	Sun, 19 Oct 2014 22:40:53 +0100
From:	Ramsay Jones <ramsay@...say1.demon.co.uk>
To:	Randy Dunlap <rdunlap@...radead.org>,
	Mariusz Gorski <marius.gorski@...il.com>,
	linux-kernel@...r.kernel.org,
	Linux-Sparse <linux-sparse@...r.kernel.org>
Subject: Re: Sparse warning: "initializer entry defined twice" - sparse can't
 handle bool?

On 19/10/14 18:21, Randy Dunlap wrote:
> [adding linux-sparse mailing list]
> 
> On 10/19/14 02:46, Mariusz Gorski wrote:
>> Sparse throws the following warning, which I can't really understand:
>>
>> $ make drivers/staging/vt6655/ C=2
>> [...]
>>   CHECK   drivers/staging/vt6655/datarate.c
>> drivers/staging/vt6655/datarate.c:302:40: warning: Initializer entry
>> defined twice
>> drivers/staging/vt6655/datarate.c:302:46:   also defined here
>>
>> The code looks fine to me:
>> bool bAutoRate[MAX_RATE]    = {true, true, true, true, false, false,
>> true, true, true, true, true, true};
>>
>> I've googled it and found only this LKML discussion:
>> https://lkml.org/lkml/2010/5/7/31
>>
>> I've tested the suggested code sample and here are the results:
>> $ cat foo.c
>> typedef _Bool bool;
>> enum {
>>      false = 0,
>>      true = 1
>> };
>> static const bool foo[10] = {
>>        true,
>>        true,
>>        false,
>>        false,
>> };
>>
>> $ sparse foo.c
>> foo.c:7:8: warning: Initializer entry defined twice
>> foo.c:8:8:   also defined here
>>
>> It this a sparse problem?

Yes, I imagine you are using a sparse version of v0.5.0 or
earlier right?

This was fixed by commit b3e9d87c6 ("sparse: make bits_to_bytes
round up instead of down", 16-07-2014), which describes to
v0.5.0-17-gb3e9d87, which has not been included in a released
version yet. (if you don't mind building from source, you could
build the master branch using a clone the git repository at
git://git.kernel.org/pub/scm/devel/sparse/sparse.git).

I'm afraid that I don't know when the next release is due.

HTH

ATB,
Ramsay Jones


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