On Wednesday 04 May 2011 10:06:30 Sven Eckelmann wrote:
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 1234)
+#define BAT_KFREE_RCU0(n, x) \
static void bat_kfree_rcu_##n(struct rcu_head *head) \{\unsigned long offset = (unsigned long)(x);\kfree((void *)head - offset);\}+#define BAT_KFREE_RCU1(n,x) BAT_KFREE_RCU0(n##z,x) BAT_KFREE_RCU0(n##o,x+1UL) +#define BAT_KFREE_RCU2(n,x) BAT_KFREE_RCU1(n##z,x) BAT_KFREE_RCU1(n##o,x+2UL) +#define BAT_KFREE_RCU3(n,x) BAT_KFREE_RCU2(n##z,x) BAT_KFREE_RCU2(n##o,x+4UL) +#define BAT_KFREE_RCU4(n,x) BAT_KFREE_RCU3(n##z,x) BAT_KFREE_RCU3(n##o,x+8UL) +#define BAT_KFREE_RCU5(n,x) BAT_KFREE_RCU4(n##z,x) BAT_KFREE_RCU4(n##o,x+16UL) +#define BAT_KFREE_RCU6(n,x) BAT_KFREE_RCU5(n##z,x) BAT_KFREE_RCU5(n##o,x+32UL) +#define BAT_KFREE_RCU7(n,x) BAT_KFREE_RCU6(n##z,x) BAT_KFREE_RCU6(n##o,x+64UL) +#define BAT_KFREE_RCU8(n,x) BAT_KFREE_RCU7(n##z,x) BAT_KFREE_RCU7(n##o,x+128UL)
How about something like this (in compat.h):
static void free_rcu_gw_node(struct rcu_head *rcu) { struct gw_node *gw_node;
gw_node = container_of(rcu, struct gw_node, rcu); kfree(gw_node); }
#define kfree_rcu(ptr, rcu_head) call_rcu(&ptr->rcu_head, free_rcu_##ptr);
Disclaimer: This is a proof of concept to convey the idea - I did not even try to compile this code.
Obviously, we would need an extra function for each kfree_rcu() call.
Regards, Marek