netdev - Re: [net 07/13] ice: Use order_base_2 to calculate higher power of 2

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Message-ID: <ac7886bf-364b-d13f-abc1-d35f7326598c@cogentembedded.com>
Date:   Fri, 24 Aug 2018 18:53:44 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     "Keller, Jacob E" <jacob.e.keller@...el.com>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "nhorman@...hat.com" <nhorman@...hat.com>,
        "sassmann@...hat.com" <sassmann@...hat.com>,
        "jogreene@...hat.com" <jogreene@...hat.com>,
        "Venkataramanan, Anirudh" <anirudh.venkataramanan@...el.com>
Subject: Re: [net 07/13] ice: Use order_base_2 to calculate higher power of 2

On 08/24/2018 06:39 PM, Keller, Jacob E wrote:

>>> From: Jacob Keller <jacob.e.keller@...el.com>
>>>
>>> Currently, we use a combination of ilog2 and is_power_of_2() to
>>> calculate the next power of 2 for the qcount. This appears to be causing
>>> a warning on some combinations of GCC and the Linux kernel:
>>>
>>> MODPOST 1 modules
>>> WARNING: "____ilog2_NaN" [ice.ko] undefined!
>>>
>>> This appears to because because GCC realizes that qcount could be zero
>>
>>     One "because" is enough. :-)
> 
> Woops! Thanks for catching it.

   You probably meant to type "happen" instead of the 1st because...

> Regards,
> Jake

MBR, Sergei