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

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Date:	Tue, 22 Jul 2014 11:51:06 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Sonic Zhang <sonic.adi@...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, 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.



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