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SubjectRe: [PATCH v6] x86/hpet: Reduce HPET counter read contention
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On 08/12/2016 05:59 PM, Waiman Long wrote:
> + * The lock and the hpet value are stored together and can be read in a
> + * single atomic 64-bit read. It is explicitly assumed that arch_spinlock_t
> + * is 32 bits in size.

This requirement forces us to give up all of the goodness of lockdep.
Is this strictly a performance optimization or is there some function
requirement behind it as well?

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