On Tue, 2011-10-18 at 12:07 +0200, Johannes Berg wrote:
> 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?
Doesn't work either -- the new rcu_head will be included in existing
header files like dst.h and they'd get messed up if included after
compat-3.0.h
johannes
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