linux-kernel - Re: [PATCH] spi: bcm2835aux: use 64-bit arithmetic instead of 32-bit

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Message-ID: <275feee3-7140-498b-714f-4c88a302d3f6@embeddedor.com>
Date:   Mon, 12 Feb 2018 12:04:34 -0600
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Mark Brown <broonie@...nel.org>, Eric Anholt <eric@...olt.net>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-spi@...r.kernel.org
Subject: Re: [PATCH] spi: bcm2835aux: use 64-bit arithmetic instead of 32-bit

Hi Ard,

On 02/08/2018 03:54 AM, Ard Biesheuvel wrote:
> On 7 February 2018 at 16:00, Gustavo A. R. Silva <gustavo@...eddedor.com> wrote:
>> Add suffix ULL to constant 9 in order to give the compiler complete
>> information about the proper arithmetic to use. Notice that this
>> constant is used in a context that expects an expression of type
>> unsigned long long (64 bits, unsigned).
>>
>> The expression tfr->len * 9 * 1000000 is currently being evaluated
>> using 32-bit arithmetic.
>>
>> Addresses-Coverity-ID: 1339619
> 
> What does this number mean? If it is an index into some internal
> database, please remove it.
> 

This is a unique Coverity identifier. We want to keep information like 
public Bugzilla IDs and tools like Coverity on the commit message.

Thanks
--
Gustavo