On Thu, Sep 13, 2007 at 02:22:45AM -0700, Matthew Helsley wrote:
> On Wed, 2007-09-12 at 18:01 -0700, Paul E. McKenney wrote:
> > The _safe list iterators make a blanket statement about how they are
> > safe against removal. This patch, inspired by private conversations
> > with people who unwisely but perhaps understandably took this blanket
> > statement at its word, adds comments stating limits to this safety.
> >
> > Signed-off-by: Paul E. McKenney <[EMAIL PROTECTED]>
> > ---
> >
> > list.h | 42 ++++++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 42 insertions(+)
> >
> > diff -urpNa -X dontdiff linux-2.6.22/include/linux/list.h
> > linux-2.6.22-safedoc/include/linux/list.h
> > --- linux-2.6.22/include/linux/list.h 2007-07-08 16:32:17.000000000
> > -0700
> > +++ linux-2.6.22-safedoc/include/linux/list.h 2007-09-12
> > 17:45:38.000000000 -0700
> > @@ -472,6 +472,12 @@ static inline void list_splice_init_rcu(
> > * @pos: the &struct list_head to use as a loop cursor.
> > * @n: another &struct list_head to use as temporary storage
> > * @head: the head for your list.
> > + *
> > + * Please note that this is safe only against removal by the code in
>
> I'm not trying to be snarky but how far should we go before expecting
> folks to read the macros? Depending on the answer you may also want to
> mention that without additional additional code it's safe only against
> removal of the list element at pos.
Good question. In fact, I would have agreed with you before coming
across people who in my experience are generally reasonably well clued
in who were confused about this.
Thanx, Paul
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