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Understood. Just wanted to raise the issue. No pressing need to resolve it now, but it's on Red Hat's radar and now it's on the community's radar :-)It seems to me that SPIN_LOCK_READS_BETWEEN_CMPXCHG may have the property that varying it at runtime based on the characteristics of the particular chip running the application might be worthwhile.
Nothing prevents a machine from defining the macro to use a global variable that is set by some machine-specific initialization code.
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