On Tue, 9 May 2006, Chris Wright wrote: > Add "always lock'd" implementations of set_bit, clear_bit and > change_bit and the corresponding test_and_ functions. Also add > "always lock'd" implementation of cmpxchg. These give guaranteed > strong synchronisation and are required for non-SMP kernels running on > an SMP hypervisor. Could you explain why this is done and what is exactly meant with "always looked"? Wh the performance impact?
