Signed-off-by: Sven Eckelmann sven@narfation.org --- This is pure speculation and only to show how ugly it is... It is currently not used in Linus' tree
~~~~~~~~~~~~~~~~~~~~ DONT APPLY THIS PATCH ~~~~~~~~~~~~~~~~~~~~
Makefile.kbuild | 1 + compat.c | 41 +++++++++++++++++++++++++++++++++++++++++ compat.h | 28 ++++++++++++++++++++++++++++ 3 files changed, 70 insertions(+), 0 deletions(-) create mode 100644 compat.c
diff --git a/Makefile.kbuild b/Makefile.kbuild index 0a35006..be0cbd9 100644 --- a/Makefile.kbuild +++ b/Makefile.kbuild @@ -50,4 +50,5 @@ batman-adv-y += soft-interface.o batman-adv-y += translation-table.o batman-adv-y += unicast.o batman-adv-y += vis.o +batman-adv-y += compat.o batman-adv-y += bat_printk.o diff --git a/compat.c b/compat.c new file mode 100644 index 0000000..0a8075e --- /dev/null +++ b/compat.c @@ -0,0 +1,41 @@ +#include <linux/sysfs.h> +#include <linux/netdevice.h> +#include "compat.h" + +#define RCU_DEFINITION0(n, x) void bat_kfree_rcu_##n(struct rcu_head *head) \ + {\ + unsigned long offset = (unsigned long)(x);\ + kfree((void *)head - offset);\ + } + +#define RCU_DEFINITION1(n,x) RCU_DEFINITION0(z##n,x) RCU_DEFINITION0(o##n,x+1) +#define RCU_DEFINITION2(n,x) RCU_DEFINITION1(z##n,x) RCU_DEFINITION1(o##n,x+2) +#define RCU_DEFINITION3(n,x) RCU_DEFINITION2(z##n,x) RCU_DEFINITION2(o##n,x+4) +#define RCU_DEFINITION4(n,x) RCU_DEFINITION3(z##n,x) RCU_DEFINITION3(o##n,x+8) +#define RCU_DEFINITION5(n,x) RCU_DEFINITION4(z##n,x) RCU_DEFINITION4(o##n,x+16) +#define RCU_DEFINITION6(n,x) RCU_DEFINITION5(z##n,x) RCU_DEFINITION5(o##n,x+32) +#define RCU_DEFINITION7(n,x) RCU_DEFINITION6(z##n,x) RCU_DEFINITION6(o##n,x+64) +#define RCU_DEFINITION8(n,x) RCU_DEFINITION7(z##n,x) RCU_DEFINITION7(o##n,x+128) +#define RCU_DEFINITION9(n,x) RCU_DEFINITION8(z##n,x) RCU_DEFINITION8(o##n,x+256) +#define RCU_DEFINITION10(n,x) RCU_DEFINITION9(z##n,x) RCU_DEFINITION9(o##n,x+512) +#define RCU_DEFINITION11(n,x) RCU_DEFINITION10(z##n,x) RCU_DEFINITION10(o##n,x+1024) +#define RCU_DEFINITION12(n,x) RCU_DEFINITION11(z##n,x) RCU_DEFINITION11(o##n,x+2048) + +RCU_DEFINITION12(s, 0) + +#define RCU_DECLARATION0(n) &bat_kfree_rcu_##n +#define RCU_DECLARATION1(n) RCU_DECLARATION0(z##n), RCU_DECLARATION0(o##n) +#define RCU_DECLARATION2(n) RCU_DECLARATION1(z##n), RCU_DECLARATION1(o##n) +#define RCU_DECLARATION3(n) RCU_DECLARATION2(z##n), RCU_DECLARATION2(o##n) +#define RCU_DECLARATION4(n) RCU_DECLARATION3(z##n), RCU_DECLARATION3(o##n) +#define RCU_DECLARATION5(n) RCU_DECLARATION4(z##n), RCU_DECLARATION4(o##n) +#define RCU_DECLARATION6(n) RCU_DECLARATION5(z##n), RCU_DECLARATION5(o##n) +#define RCU_DECLARATION7(n) RCU_DECLARATION6(z##n), RCU_DECLARATION6(o##n) +#define RCU_DECLARATION8(n) RCU_DECLARATION7(z##n), RCU_DECLARATION7(o##n) +#define RCU_DECLARATION9(n) RCU_DECLARATION8(z##n), RCU_DECLARATION8(o##n) +#define RCU_DECLARATION10(n) RCU_DECLARATION9(z##n), RCU_DECLARATION9(o##n) +#define RCU_DECLARATION11(n) RCU_DECLARATION10(z##n), RCU_DECLARATION10(o##n) +#define RCU_DECLARATION12(n) RCU_DECLARATION11(z##n), RCU_DECLARATION11(o##n) + +bat_rcu_callback bat_kfree_rcu_offset[_BAT_MAX_KFREE_RCU_OFFSET] = {RCU_DECLARATION12(s)}; + diff --git a/compat.h b/compat.h index 0c5ad82..a297b0d 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 4096 +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_ */