Messages in this thread | | | Date | Wed, 25 Sep 2002 14:04:48 +0200 (MEST) | From | Geert Uytterhoeven <> | Subject | Re: 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/
| |