Messages in this thread | | | Subject | Re: What is the difference between percpu_xxx and this_cpu_xxx? | From | Eric Dumazet <> | Date | Tue, 13 Sep 2011 08:11:06 +0200 |
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Le mardi 13 septembre 2011 à 12:28 +0800, Huang Ying a écrit : > Hi, > > If my understanding was correct, from the kernel source code, it appears > that percpu_xxx and this_cpu_xxx have the same semantics and > implementation in effect, haven’t them? > > If so, why do we need two API for the same thing?
History mostly, and transition.
percpu_inc() was an x86 only thing
__get_cpu_var(var)++ -> percpu_inc(var) -> this_cpu_inc(var)
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