batman-adv/src/compat-hacks.h

   1 /* Please avoid adding hacks here - instead add it to mac80211/backports.git */
   2
   3 #undef CONFIG_MODULE_STRIPPED
   4
   5 #include <linux/version.h>      /* LINUX_VERSION_CODE */
   6 #include <linux/types.h>
   7
   8 #if LINUX_VERSION_IS_LESS(6, 0, 0)
   9
  10 #define __vstring(item, fmt, ap) __dynamic_array(char, item, 256)
  11 #define __assign_vstr(dst, fmt, va) \
  12         WARN_ON_ONCE(vsnprintf(__get_dynamic_array(dst), 256, fmt, *va) >= 256)
  13
  14 #endif /* LINUX_VERSION_IS_LESS(6, 0, 0) */
  15
  16 #if LINUX_VERSION_IS_LESS(6, 2, 0)
  17
  18 #include <linux/random.h>
  19
  20 #define genl_split_ops genl_ops
  21
  22 static inline u32 batadv_get_random_u32_below(u32 ep_ro)
  23 {
  24         return prandom_u32_max(ep_ro);
  25 }
  26
  27 #define get_random_u32_below batadv_get_random_u32_below
  28
  29 #endif /* LINUX_VERSION_IS_LESS(6, 2, 0) */
  30
  31 #if LINUX_VERSION_IS_LESS(6, 4, 0)
  32
  33 #include <linux/if_vlan.h>
  34
  35 /* Prefer this version in TX path, instead of
  36  * skb_reset_mac_header() + vlan_eth_hdr()
  37  */
  38 static inline struct vlan_ethhdr *skb_vlan_eth_hdr(const struct sk_buff *skb)
  39 {
  40         return (struct vlan_ethhdr *)skb->data;
  41 }
  42
  43 #endif /* LINUX_VERSION_IS_LESS(6, 4, 0) */
  44
  45 /* <DECLARE_EWMA> */
  46
  47 #include <linux/version.h>
  48 #include_next <linux/average.h>
  49
  50 #include <linux/bug.h>
  51
  52 #ifdef DECLARE_EWMA
  53 #undef DECLARE_EWMA
  54 #endif /* DECLARE_EWMA */
  55
  56 /*
  57  * Exponentially weighted moving average (EWMA)
  58  *
  59  * This implements a fixed-precision EWMA algorithm, with both the
  60  * precision and fall-off coefficient determined at compile-time
  61  * and built into the generated helper funtions.
  62  *
  63  * The first argument to the macro is the name that will be used
  64  * for the struct and helper functions.
  65  *
  66  * The second argument, the precision, expresses how many bits are
  67  * used for the fractional part of the fixed-precision values.
  68  *
  69  * The third argument, the weight reciprocal, determines how the
  70  * new values will be weighed vs. the old state, new values will
  71  * get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
  72  * that this parameter must be a power of two for efficiency.
  73  */
  74
  75 #define DECLARE_EWMA(name, _precision, _weight_rcp)                     \
  76         struct ewma_##name {                                            \
  77                 unsigned long internal;                                 \
  78         };                                                              \
  79         static inline void ewma_##name##_init(struct ewma_##name *e)    \
  80         {                                                               \
  81                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
  82                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
  83                 /*                                                      \
  84                  * Even if you want to feed it just 0/1 you should have \
  85                  * some bits for the non-fractional part...             \
  86                  */                                                     \
  87                 BUILD_BUG_ON((_precision) > 30);                        \
  88                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
  89                 e->internal = 0;                                        \
  90         }                                                               \
  91         static inline unsigned long                                     \
  92         ewma_##name##_read(struct ewma_##name *e)                       \
  93         {                                                               \
  94                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
  95                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
  96                 BUILD_BUG_ON((_precision) > 30);                        \
  97                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
  98                 return e->internal >> (_precision);                     \
  99         }                                                               \
 100         static inline void ewma_##name##_add(struct ewma_##name *e,     \
 101                                              unsigned long val)         \
 102         {                                                               \
 103                 unsigned long internal = READ_ONCE(e->internal);        \
 104                 unsigned long weight_rcp = ilog2(_weight_rcp);          \
 105                 unsigned long precision = _precision;                   \
 106                                                                         \
 107                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 108                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 109                 BUILD_BUG_ON((_precision) > 30);                        \
 110                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 111                                                                         \
 112                 WRITE_ONCE(e->internal, internal ?                      \
 113                         (((internal << weight_rcp) - internal) +        \
 114                                 (val << precision)) >> weight_rcp :     \
 115                         (val << precision));                            \
 116         }
 117
 118 /* </DECLARE_EWMA> */