OK, I have spent quite a while bashing my head against this brick wall
now, trying to suss out why the lowlatency kernel build chokes, whilst
the generic does not. I suspect it is heavily buried somewhere either in
the compiler flags or in the deeper headers.
This is what I have found so far: if
Dug deeper, got more answers, but also more questions: rcupdate.h is heavily
conditional on PREEMPT causing __rcu_read_lock/unlock to be extern rather than
inline.
However, this leaves the most fundamental question of all: why are some
functions OK to call from non-GPL code but others not?
It would help if the Broadcom's brcmsmac developers would pick up the
pace a little and get something into the kernel that is stable,
effective, open source and supported. I only tried switching back to iwl
because brcmsmac is both deaf and drops out frequently on my BCM4313
chipset.
Not to
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