Re: page table lock patch V15 [0/7]: overview II

Andi Kleen
2005-01-14T10:47:32Z

> I have a question for the x86 gurus. We're currently using the lock
> prefix for set_64bit. This will lock the bus for the RMW cycle, but
> is it a prerequisite for the atomic 64-bit store? Even on UP?

An atomic 64bit store doesn't need a lock prefix. A cmpxchg will
need to though. Note that UP kernels define LOCK to nothing.

-Andi