netdev - Re: [PATCH net-next v2 6/6] packet: rollover statistics

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Message-ID: <CA+FuTSc5AJA7_p_mAT9DXqsBDd-D=HSZ=yJnofFnQLisFNom9Q@mail.gmail.com>
Date:	Tue, 12 May 2015 11:04:19 -0400
From:	Willem de Bruijn <willemb@...gle.com>
To:	David Miller <davem@...emloft.net>
Cc:	Network Development <netdev@...r.kernel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	David Laight <david.laight@...lab.com>
Subject: Re: [PATCH net-next v2 6/6] packet: rollover statistics

>>
>> +struct tpacket_rollover_stats {
>> +     unsigned long   tp_all;
>> +     unsigned long   tp_huge;
>> +     unsigned long   tp_failed;
>> +};
>
> Please do not use variably sized types, especially "long" for user exported
> interfaces.  Otherwise you will need to add a compat layer to translate
> the data into userspace for 32-bit tasks running on a 64-bit kernel.
>
> If a 32-bit value really is not sufficient, use __aligned_u64.

Thanks for catching that. I converted them to __aligned_u64. The
internal counters remain atomic_long_t.

I'll push v3 of the patchset with only this change.
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