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SubjectRe: [PATCH] x86 alternatives : fix LOCK_PREFIX race with preemptible kernel and CPU hotplug
> So, unless these calculus are completely bogus, the difference between the nop
> and the DS case seems not to be statistically significant.

My understanding was that the nops only make a measurable difference in the
-pg/mcount/ftrace patched out case where every function call starts with a 5
byte nop.

Presumably function calls are much more common than lock prefix operations.

-Andi


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