Hi Ben,

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? https://ci-rt.linutronix.de/RT-Test/kbuild.jsp?id=112

Some of the builds are failing (allmodconfig), though it
doesn't look cip-rt specific, eg:

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????kernel/utilities/compiletest-runner at 2/build/../include/linux/compiler.h:484 call to ?__compiletime_assert_150? declared with attribute error: BUILD_BUG_ON failed: hw_flag_names[NUM_IEEE80211_HW_FLAGS] != (void *)0x1

Not sure how to handle those. IIRC, we don't support allmodconfig.

yes but adding
? 68920c973254 ("net/mac80211/debugfs.c: prevent build failure with
? CONFIG_UBSAN=y")

could solve the issue.

Okay, I just don't know if Ben wants to add the patch to his tree though.

If the patch solves the issue then please forward the patch upstream.
The "normal" v4.4 stable tree is affected by this, too.

4.4-stable doesn't have UBSAN.  Are some other configurations (or
compiler versions) where this code fails to build?  (I'm a bit
surprised that it ever compiled!)

The problem was introduced by 30686bf7f5b3 ("mac80211: convert HW flags
to unsigned long bitmap"). The only LTS kernel which is missing the
68920c973254 ("net/mac80211/debugfs.c: prevent build failure with
CONFIG_UBSAN=y") fix is the 4.4. The other don't have 30686bf7f5b3, e.g.
4.1, or have 30686bf7f5b3 and 68920c973254, e.g. 4.9.

I've sent 68920c973254 to stable for inclusion into 4.4.

	https://www.spinics.net/lists/stable/msg209228.html

Thanks,
Daniel