Linus Torvalds wrote:
quoted text
> Can you explain what this does and who needs it? The percpu_xchg() looks 
> particularly pointless, since it's always a locked SMP-safe instruction on 
> x86, so a nonpreemptible load+store will likely be much faster.

The essence of those changes is to work towards unifying the i386 and 
x86-64 percpu mechanisms.  But I wasn't terribly convinced by some of 
the frills around the edges, like the xchg operation.  The work is being 
driven by Mike Travis and the huge numa people, so perhaps they have a 
use for it.

    J

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