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SubjectRe: RFC: patch to allow lock-free traversal of lists with insertion
>> Here are two patches.  The wmbdd patch has been modified to use
>> the lighter-weight SPARC instruction, as suggested by Dave Miller.
>> The rmbdd patch defines an rmbdd() primitive that is defined to be
>> rmb() on Alpha and a nop on other architectures. I believe this
>> rmbdd() primitive is what Richard is looking for.
>Surely we don't need both? If rmbdd exists, any code needing wmbdd
>is terminally broken?

One or the other. And at this point, it looks like rmbdd() (or
read_cache_depends()) is the mechanism of choice, given wmbdd()'s
performance on Alpha.

Thanx, Paul
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