Btw, I think I've now merged everything to bring us back to where we
wanted to be - can people verify that the architecture they care about has
all the right "read_can_lock()" etc infrastructure (and preferably that it
_works_ too ;), and that I've not missed of incorrectly ignored some
patch
this patch, against BK-curr, implements a nonintrusive spin-polling loop
for the SMP+PREEMPT spinlock/rwlock variants, using the new *_can_lock()
primitives. (The patch also adds *_can_lock() to the UP branch of
spinlock.h, for completeness.)
build- and boot-tested on x86 SMP+PREEMPT and SMP+!PRE
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