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

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Date:   Mon, 12 Feb 2018 19:11:59 +0000
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Mark Brown <broonie@...nel.org>, Eric Anholt <eric@...olt.net>,
        Stefan Wahren <stefan.wahren@...e.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

On 12 February 2018 at 19:10, Florian Fainelli <f.fainelli@...il.com> wrote:
> On 02/12/2018 10:45 AM, Ard Biesheuvel wrote:
>> On 12 February 2018 at 18:04, Gustavo A. R. Silva
>> <garsilva@...eddedor.com> wrote:
>>> 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.
>>>
>>
>> Who is 'we' in this case? And how is this id to any benefit of other
>> people that have been excluded from 'we'?
>
> We is probably the greater Linux community here.
>
>>
>> If you add identifiers like this, make sure that they don't only make
>> sense to the in-crowd. For instance, you could replace this with a
>> http link to the database entry if you really must.
>
> I don't think it is that easy to extract good URLs from the public Linux
> coverity instance which is why referring to coverity IDs is being done
> AFAICT.

Ah ok, pardon my ignorance then. I wasn't aware there is a public
Linux coverity instance. Got a link?