Signed-off-by: Sven Eckelmann sven@narfation.org --- compat.c | 37 +++++++++++++++++++++++++++++++++++++ compat.h | 28 ++++++++++++++++++++++++++++ 2 files changed, 65 insertions(+), 0 deletions(-)
diff --git a/compat.c b/compat.c index f4561c3..881420f 100644 --- a/compat.c +++ b/compat.c @@ -1,4 +1,7 @@ #include <linux/version.h> +#include <linux/sysfs.h> +#include <linux/netdevice.h> +#include "compat.h"
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
@@ -959,3 +962,37 @@ int bat_seq_printf(struct seq_file *m, const char *f, ...) }
#endif /* < KERNEL_VERSION(2, 6, 29) */ + +#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) + +BAT_KFREE_RCU8(s, 0UL) + +#define LKRCU0(n) &bat_kfree_rcu_##n +#define LKRCU1(n) LKRCU0(n##z), LKRCU0(n##o) +#define LKRCU2(n) LKRCU1(n##z), LKRCU1(n##o) +#define LKRCU3(n) LKRCU2(n##z), LKRCU2(n##o) +#define LKRCU4(n) LKRCU3(n##z), LKRCU3(n##o) +#define LKRCU5(n) LKRCU4(n##z), LKRCU4(n##o) +#define LKRCU6(n) LKRCU5(n##z), LKRCU5(n##o) +#define LKRCU7(n) LKRCU6(n##z), LKRCU6(n##o) +#define LKRCU8(n) LKRCU7(n##z), LKRCU7(n##o) + +bat_rcu_callback bat_kfree_rcu_offset[_BAT_MAX_KFREE_RCU_OFFSET] = {LKRCU8(s)}; + +#endif /* < KERNEL_VERSION(2, 6, 1234) */ diff --git a/compat.h b/compat.h index 0c5ad82..59bd752 100644 --- a/compat.h +++ b/compat.h @@ -288,4 +288,32 @@ int bat_seq_printf(struct seq_file *m, const char *f, ...);
#endif /* < KERNEL_VERSION(2, 6, 36) */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 1234) + +#define _BAT_MAX_KFREE_RCU_OFFSET 256 +typedef void (*bat_rcu_callback)(struct rcu_head *); +extern bat_rcu_callback bat_kfree_rcu_offset[_BAT_MAX_KFREE_RCU_OFFSET]; + +static __always_inline bool __is_kfree_rcu_offset(unsigned long offset) +{ + return offset < _BAT_MAX_KFREE_RCU_OFFSET; +} + +static __always_inline +void __kfree_rcu(struct rcu_head *head, unsigned long offset) +{ + BUILD_BUG_ON(!__builtin_constant_p(offset)); + BUILD_BUG_ON(!__is_kfree_rcu_offset(offset)); + + call_rcu(head, (bat_rcu_callback)bat_kfree_rcu_offset[offset]); +} + +extern void kfree(const void *); + +#define kfree_rcu(ptr, rcu_head) \ + __kfree_rcu(&((ptr)->rcu_head), offsetof(typeof(*(ptr)), rcu_head)) + + +#endif /* < KERNEL_VERSION(2, 6, 1234) */ + #endif /* _NET_BATMAN_ADV_COMPAT_H_ */