linux-kernel - Re: [PATCH] Re: WAN: new PPP code for generic HDLC

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Message-ID: <m37ig7sq21.fsf@maximus.localdomain>
Date:	Wed, 12 Mar 2008 20:25:10 +0100
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Jeff Garzik <jeff@...zik.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH] Re: WAN: new PPP code for generic HDLC

Stephen Hemminger <shemminger@...tta.com> writes:

>> +struct hdlc_header {
>> +	u8 address;
>> +	u8 control;
>> +	__be16 protocol;
>> +} __attribute__ ((packed));
>> +
>> +struct cp_header {
>> +	u8 code;
>> +	u8 id;
>> +	__be16 len;
>> +} __attribute__ ((packed));
>> +
>
> If I remember correctly, the packed is unnecessary for structures like this
> and causes GCC to generate worse code.

Interesting. Gcc obviously will do the right thing without "packed",
at least on "current" architectures, but I don't know what the C
standard says. I will remove it, thanks.
-- 
Krzysztof Halasa
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