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

On 3/14/2018 5:10 PM, Kalle Valo wrote:

Rafał Miłecki [off-list ref] writes:

quoted

quoted

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+	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