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SubjectRe: cmpxchg in 2.5.38
On Wed, 25 Sep 2002, Ingo Molnar wrote:
> On Wed, 25 Sep 2002, Oleg Drokin wrote:
> > Ingo's argument was that since there is only one place in code that
> > accesses that variable (map->page), it is safe to rely on such a
> > crippled cmpxchg implementation.
> yes. It's only this place in the code that ever modifies that word, and
> that happens only once during the lifetime of this address, so i'll rather
> add a spinlock to the generic PID allocator code, it's a very very rare
> slowpath.

Furthermore archs that have cmpxchg() define __HAVE_ARCH_CMPXCHG, while
currently no code tests for it...



Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds

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