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From: Sven Eckelmann <sven@narfation.org>
Subject: Re: Unknown symbol cfg80211_get_station
Date: Wed, 10 Jul 2019 10:28:58 +0200
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To: Stefan Bader <stefan.bader@canonical.com>
Cc: Moritz Warning <moritzwarning@web.de>, b.a.t.m.a.n@lists.open-mesh.org, Ubuntu Kernel Team <kernel-team@lists.ubuntu.com>

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On Wednesday, 10 July 2019 10:23:21 CEST Stefan Bader wrote:
> On 06.07.19 17:22, Moritz Warning wrote:
> > Thanks Sven for having a good look.
> > 
> > There is no cfg80211 module present on the system (find /lib/modules/4.15.0-1032-aws/ -name *80211*).
> > Package linux-modules-4.15.0-1032-aws is installed.
> 
> The aws kernel is intended to be used on instances in the Amazon cloud. There is
> no wifi hardware present on those instances, so it generally makes no sense to
> have those modules.

Yes, but then please don't compile it in. Otherwise other modules (which make 
sense on a server) build against functions from cfg80211 and *don't* end up with 
a nop-stub - just because the actual implementation was compiled as part of the 
cfg80211 module (but not shipped).

> As Jens pointed out the missing modules are in linux-modules-extra not in
> linux-modules (the former is not installed by default).

Who is Jens and where did he point something out?

On Saturday, 6 July 2019 17:22:01 CEST Moritz Warning wrote:
> The module linux-modules-extra-4.15.0-1032 installs the following files:
> 
> /lib/modules/4.15.0-1032-gcp/kernel/net/wireless/cfg80211.ko
> /lib/modules/4.15.0-1032-gke/kernel/net/wireless/cfg80211.ko
> /lib/modules/4.15.0-1032-azure/kernel/net/wireless/cfg80211.ko
> 
> But this is not in the *-aws path.

It looks to me like Moritz checked it (I didn't) and they were not available 
for his aws kernel.

Kind regards,
	Sven

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