On Thu, Nov 06, 2014 at 11:06:59AM -0800, Ben Pfaff wrote:
> On Thu, Nov 06, 2014 at 11:02:56AM -0800, Ben Pfaff wrote:
> > On Mon, Nov 03, 2014 at 11:39:00AM -0800, Jarno Rajahalme wrote:
> > > Returning const struct cls_rule pointers from the classifier API helps
> > > callers to remember that they should not modify the rules returned.
> > >
> > > Signed-off-by: Jarno Rajahalme <jrajaha...@nicira.com>
> >
> > I don't think it has much practical effect since most of the callers
> > immediately cast the pointer to some other container type, but it does
> > seem a little nicer.
> >
> > Acked-by: Ben Pfaff <b...@nicira.com>
>
> But you'll need to fix up ovs-router.c, which I think is new since you
> posted this. It has some build failures (GCC and sparse output
> interleaved below):
>
> ../lib/ovs-router.c:142:8: warning: incorrect type in assignment (different
> modifiers)
> ../lib/ovs-router.c:142:8: expected struct cls_rule *cr
> ../lib/ovs-router.c:142:8: got struct cls_rule const *
> ../lib/ovs-router.c:145:12: warning: incorrect type in assignment (different
> modifiers)
> ../lib/ovs-router.c:145:12: expected struct cls_rule *cr
> ../lib/ovs-router.c:145:12: got struct cls_rule const *
> ../lib/ovs-router.c: In function 'rt_entry_delete':
> ../lib/ovs-router.c:142:8: error: assignment discards 'const' qualifier from
> pointer target type [-Werror]
> cr = classifier_find_rule_exactly(&cls, &rule);
> ^
> ../lib/ovs-router.c:145:12: error: assignment discards 'const' qualifier from
> pointer target type [-Werror]
> cr = classifier_remove(&cls, cr);
> ^
And actually the code in question makes one wonder whether we should
either abandon this change or make classifier_remove() take a const
pointer too:
cr = classifier_find_rule_exactly(&cls, &rule);
if (cr) {
/* Remove it. */
cr = classifier_remove(&cls, cr);
if (cr) {
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