netdev - Re: [PATCH] brcmfmac: drop Inter-Access Point Protocol packets by default

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Date:   Wed, 14 Mar 2018 21:55:23 +0100
From:   Arend van Spriel <arend.vanspriel@...adcom.com>
To:     Kalle Valo <kvalo@...eaurora.org>,
        Rafał Miłecki <rafal@...ecki.pl>
Cc:     Rafał Miłecki <zajec5@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-Hsien Lin <chi-hsien.lin@...ress.com>,
        Wright Feng <wright.feng@...ress.com>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@...adcom.com>,
        James Hughes <james.hughes@...pberrypi.org>,
        linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        brcm80211-dev-list@...ress.com, netdev@...r.kernel.org,
        Linus Lüssing <linus.luessing@...3.blue>,
        Felix Fietkau <nbd@....name>, bridge@...ts.linux-foundation.org
Subject: Re: [PATCH] brcmfmac: drop Inter-Access Point Protocol packets by
 default

On 3/14/2018 5:10 PM, Kalle Valo wrote:
> Rafał Miłecki <rafal@...ecki.pl> writes:
>
>>>> +	unsigned char *eth_data = skb_mac_header(skb) + ETH_HLEN;
>>>> +#if !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
>>>
>>> #ifndef?
>>
>> I followed what is used in the include/linux/etherdevice.h. Is that a
>> good exceuse? Could it be there any some good reason for #if defined()?
>
> Don't know, maybe just a matter of taste? But it would be nice to know
> the background behind #ifdef vs #if defined(), never figured it out why
> two different forms.

Well. In this case you could use either one, but if you have more 
conditions #if defined() is bit more efficient:

#ifdef A
#ifdef B
#endif
#endif

vs.

#if defined(A) && defined(B)

Regards,
Arend