On Mon, 10 Jun 2002, Jan Harkes wrote:
> On Mon, Jun 03, 2002 at 05:41:39PM -0300, Rik van Riel wrote:
> > > We've had this before, and it breaks some code that removes items from
> > > lists as follows,
> >
> > Such code is probably not SMP safe anyway.
>
> Where are you coming from with that comment?
>
> down(&semaphore);
>
> list_for_each(p, list)
> if (condition)
> list_del(p);
>
> up(&semaphore);
>
> Should be completely SMP safe,
Not if 'p' comes from the slab cache.
In that case 'p' can be re-allocated on another CPU
before we dereference ->next ...
regards,
Rik
-- Bravely reimplemented by the knights who say "NIH".http://www.surriel.com/ http://distro.conectiva.com/
- 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/
This archive was generated by hypermail 2b29 : Sat Jun 15 2002 - 22:00:30 EST