A complete different idea:
/* a larger rcu head struct */
struct compat_rcu_head {
struct rcu_head rh; /* must be first */
void *free_ptr;
};
/* define kfree_rcu */
extern void compat_free_rcu(struct rcu_head *rh);
#define kfree_rcu(ptr, head) \
do {
(ptr)->head.free_ptr = ptr;
call_rcu(&(ptr)->head.rh, compat_free_rcu);
} while (0)
/* use it in all code */
#define rcu_head compat_rcu_head
and somewhere in a compat.ko file:
#undef rcu_head
void compat_free_rcu(struct rcu_head *rh)
{
struct compat_rcu_head *crh = (void *)rh;
kfree(crh->free_ptr);
}
thoughts?
johannes
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