Red Hat Bugzilla – Bug 470143
mac80211 built-in, causing mysterious errors with compat-wireless
Last modified: 2010-01-29 06:55:45 EST
Description of problem:
compat-wireless (http://linuxwireless.org/en/users/Download) a way of using the latest wireless stack without building a whole new kernel, by replacing
the whole of wireless stack - which is a bit smaller and easier/quicker to
replace. Sometimes wireless-testing/compat-wireless needs to change mac80211, and this is impossible with fc10 kernels, because mac80211 is compiled-in.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. build compat-wireless,
2. make install, make unload, make load
3. mysterious errors or even kernel oops happens.
mysterious errors or even kernel oops happens.
The wireless stack + drivers replaced by compat-wireless and have operational wireless networking
fc9 kernels (e.g. kernel-126.96.36.199-24.fc9.x86_64) have mac80211 as a kernel module.
Probably should assign this to John Linville :-).
I looked through koji and found it was removed between
but the log entry between does not say why.
I advised against it for exactly this reason. The notion was that this would save time during boot and that anyone who could build compat-wireless could just build their own kernel anyway...whatever. I think it was the wrong decision.
lets move it back to modular then. There's always going to be trade-offs, and I think in this case, the benefits of a marginally slower boot are outweighed by the improved debugging you get.
compat-wireless is considerably easier and quicker to build; particularly in the situation where one wants to try out new changes (and easily revertable, just by
blowing away /lib/module/<version>/updates and then depmod -a), without whole-sale dev kernel. As for slower boot, it is probably marginal compared to per-driver initialization - and some might argue in the opposite - not all machines have wireless cards.
188.8.131.52-88.fc10.x86_64 just available on koji has the mac80211 component
* Wed Nov 05 2008 John W. Linville <email@example.com> 184.108.40.206-83
- Re-modularize mac80211 component (#470143)