netdev - Re: [PATCH V4 net-next 3/9] net: ena: add explicit casting to variables

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Message-ID: <pj41zlsg8gxj4x.fsf@u68c7b5b1d2d758.ant.amazon.com>
Date:   Tue, 8 Dec 2020 20:11:42 +0200
From:   Shay Agroskin <shayagr@...zon.com>
To:     Alexander Duyck <alexander.duyck@...il.com>
CC:     <akiyano@...zon.com>, David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Netdev <netdev@...r.kernel.org>, <dwmw@...zon.com>,
        <zorik@...zon.com>, <matua@...zon.com>, <saeedb@...zon.com>,
        <msw@...zon.com>, <aliguori@...zon.com>, <nafea@...zon.com>,
        <gtzalik@...zon.com>, <netanel@...zon.com>, <alisaidi@...zon.com>,
        <benh@...zon.com>, <ndagan@...zon.com>,
        "Jubran, Samih" <sameehj@...zon.com>, Ido Segev <idose@...zon.com>,
        Igor Chauskin <igorch@...zon.com>
Subject: Re: [PATCH V4 net-next 3/9] net: ena: add explicit casting to
 variables


Alexander Duyck <alexander.duyck@...il.com> writes:

> On Fri, Dec 4, 2020 at 4:15 AM <akiyano@...zon.com> wrote:
>>
>> From: Arthur Kiyanovski <akiyano@...zon.com>
>>
>> This patch adds explicit casting to some implicit conversions 
>> in the ena
>> driver. The implicit conversions fail some of our static 
>> checkers that
>> search for accidental conversions in our driver.
>> Adding this cast won't affect the end results, and would sooth 
>> the
>> checkers.
>>
>> Signed-off-by: Ido Segev <idose@...zon.com>
>> Signed-off-by: Igor Chauskin <igorch@...zon.com>
>> Signed-off-by: Shay Agroskin <shayagr@...zon.com>
>> Signed-off-by: Arthur Kiyanovski <akiyano@...zon.com>
>> ---
>> ...
>> @@ -2712,7 +2712,7 @@ int ena_com_indirect_table_get(struct 
>> ena_com_dev *ena_dev, u32 *ind_tbl)
>>         u32 tbl_size;
>>         int i, rc;
>>
>> -       tbl_size = (1ULL << rss->tbl_log_size) *
>> +       tbl_size = (u32)(1ULL << rss->tbl_log_size) *
>>                 sizeof(struct ena_admin_rss_ind_table_entry);
>>
>>         rc = ena_com_get_feature_ex(ena_dev, &get_resp,
>
> For these last two why not make it 1u instead of 1ull for the 
> bit
> being shifted? At least that way you are not implying possible
> truncation in the conversion.

We decided to remove this conversion from the patch altogether. We 
might do something different in the future to achieve the same 
result. Thanks for your comment