Ingo Molnar wrote:
text_poke() itself only applies/unapplies the LOCK prefix - a single byte. We shouldnt be doing that at all: the cost of LOCK is insignificant (a few cycles) and most systems are SMP anyway.
Alas, on older CPUs the cost of LOCK can be massive. The question is how much we really care - the embedded people (who would definitely be affected) will simply build UP kernels, and this only affects booting SMP kernels on UP.
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