> > > +struct xt_table_info
> > > +*xt_table_get_private_protected(const struct xt_table *table)
> > > +{
> > > + return rcu_dereference_protected(table->private,
> > > + mutex_is_locked(&xt[table->af].mutex));
> > > +}
> > > +EXPORT_SYMBOL(xt_table_get_private_protected);
> >
> > In all debug builds this function compiles to a single memory
>
> ! went missing... :/
? Not sure about "!".
!debug gets you a single deref, for debug builds do we get extra code.
Can you elaborate on this. I am not able to get the context here.
Are you referring to the definition of RCU_LOCKDEP_WARN.
RCU_LOCKDEP_WARN is a NOOP if CONFIG_PROVE_RCU is false.
#ifdef CONFIG_PROVE_RCU
#define RCU_LOCKDEP_WARN(c, s) \
do { \
static bool __section(.data.unlikely) __warned; \
if (debug_lockdep_rcu_enabled() && !__warned && (c)) { \
__warned = true; \
lockdep_rcu_suspicious(__FILE__, __LINE__, s); \
} \
} while (0)
...
#else /* #ifdef CONFIG_PROVE_RCU */
#define RCU_LOCKDEP_WARN(c, s) do { } while (0)
