netdev - Re: [PATCH v7] bfin_mac: convert bfin Ethernet driver to NAPI framework

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Message-ID: <CAJxxZ0M5EPY028e_BZHEcyiWibZCeZ1rVq3junawETRb13FUGw@mail.gmail.com>
Date:	Tue, 22 Jul 2014 18:10:07 +0800
From:	Sonic Zhang <sonic.adi@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Francois Romieu <romieu@...zoreil.com>,
	adi-buildroot-devel@...ts.sourceforge.net,
	"Zhang, Sonic" <sonic.zhang@...log.com>
Subject: Re: [PATCH v7] bfin_mac: convert bfin Ethernet driver to NAPI framework

On Tue, Jul 22, 2014 at 5:51 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Tue, 2014-07-22 at 16:53 +0800, Sonic Zhang wrote:
>
>> if (!--A)
>>
>> doesn't equal to
>>
>> if (A--)
>>         if (!A)
>
> It really does, no matter what you think.
>
> In all cases, A is decremented.
>
> In all cases, final action is done if and only if A was 1 before the
> test(s)
>
> Thats simple logic, and all your arguments about NAPI, IRQ, and moon
> phase are irrelevant.
>

Thank you for correcting. I think I made a mistake on the condition logic.

Regards,

Sonic
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