lkml.org 
[lkml]   [2002]   [Sep]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
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...

Gr{oetje,eeting}s,
Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

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

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:29    [from the cache]
©2003-2011 Jasper Spaans. Advertise on this site