linux-kernel - Re: [PATCH] mtd: spi-nor: cqspi: remove duplicate const

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Message-ID: <f5b3de86-ff3d-7d4d-65b0-83b45079461f@wedev4u.fr>
Date:   Tue, 27 Jun 2017 21:48:26 +0200
From:   Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>
To:     Marek Vasut <marek.vasut@...il.com>, Arnd Bergmann <arnd@...db.de>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Richard Weinberger <richard@....at>
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: spi-nor: cqspi: remove duplicate const

Le 27/06/2017 à 18:11, Marek Vasut a écrit :
> On 06/27/2017 05:34 PM, Arnd Bergmann wrote:
>> The variable was already marked 'const' before the previous
>> patch, but the qualifier was in an unusual place, and now the
>> extra 'const' causes a harmless warning:
>>
>> drivers/mtd/spi-nor/cadence-quadspi.c:1286:34: error: duplicate 'const' declaration specifier [-Werror=duplicate-decl-specifier]
>>
>> This removes the other 'const' instead.
> 
> Isn't that const array const elements , thus two consts ?
> IMO the original code is correct.

Indeed the 2 'const' don't have the same meaning so the original code
may be correct but with an array like cqspi_dt_ids[] we can't write
"cqspi_dt_ids = (const struct of_device_id *)<right value>;" anyway.

So I think the 2nd 'const' is useless here then if this patch removes a
warning, let's apply it, right?

> 
>> Fixes: f993c123b461 ("mtd: spi-nor: cqspi: make of_device_ids const")
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>> ---
>>  drivers/mtd/spi-nor/cadence-quadspi.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c
>> index d315c326e72f..53c7d8e0327a 100644
>> --- a/drivers/mtd/spi-nor/cadence-quadspi.c
>> +++ b/drivers/mtd/spi-nor/cadence-quadspi.c
>> @@ -1283,7 +1283,7 @@ static const struct dev_pm_ops cqspi__dev_pm_ops = {
>>  #define CQSPI_DEV_PM_OPS	NULL
>>  #endif
>>  
>> -static const struct of_device_id const cqspi_dt_ids[] = {
>> +static const struct of_device_id cqspi_dt_ids[] = {
>>  	{.compatible = "cdns,qspi-nor",},
>>  	{ /* end of table */ }
>>  };
>>
> 
>