Messages in this thread | | | Date | Fri, 25 Apr 2008 08:57:20 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 1/1] x86: fix text_poke |
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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.
-hpa
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