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_CODE < KERNEL_VERSION(4, 15, 0)
   9
  10 #include <linux/netdevice.h>
  11
  12 #define netdev_master_upper_dev_link(dev, upper_dev, upper_priv, upper_info, extack) ({\
  13         BUILD_BUG_ON(extack != NULL); \
  14         netdev_master_upper_dev_link(dev, upper_dev, upper_priv, upper_info); \
  15 })
  16
  17 #endif /* < KERNEL_VERSION(4, 15, 0) */
  18
  19
  20 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 16, 0)
  21
  22 #ifndef sizeof_field
  23 #define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
  24 #endif
  25
  26 #endif /* < KERNEL_VERSION(4, 16, 0) */
  27
  28
  29 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 1, 0)
  30
  31 #include_next <linux/igmp.h>
  32 #include_next <net/addrconf.h>
  33
  34 static inline int batadv_ipv6_mc_check_mld1(struct sk_buff *skb)
  35 {
  36         return ipv6_mc_check_mld(skb, NULL);
  37 }
  38
  39 static inline int batadv_ipv6_mc_check_mld2(struct sk_buff *skb,
  40                                             struct sk_buff **skb_trimmed)
  41 {
  42         return ipv6_mc_check_mld(skb, skb_trimmed);
  43 }
  44
  45 #define ipv6_mc_check_mld_get(_1, _2, ipv6_mc_check_mld_name, ...) ipv6_mc_check_mld_name
  46 #define ipv6_mc_check_mld(...) \
  47         ipv6_mc_check_mld_get(__VA_ARGS__, batadv_ipv6_mc_check_mld2, batadv_ipv6_mc_check_mld1)(__VA_ARGS__)
  48
  49 static inline int batadv_ip_mc_check_igmp1(struct sk_buff *skb)
  50 {
  51         return ip_mc_check_igmp(skb, NULL);
  52 }
  53
  54 static inline int batadv_ip_mc_check_igmp2(struct sk_buff *skb,
  55                                            struct sk_buff **skb_trimmed)
  56 {
  57         return ip_mc_check_igmp(skb, skb_trimmed);
  58 }
  59
  60 #define ip_mc_check_igmp_get(_1, _2, ip_mc_check_igmp_name, ...) ip_mc_check_igmp_name
  61 #define ip_mc_check_igmp(...) \
  62         ip_mc_check_igmp_get(__VA_ARGS__, batadv_ip_mc_check_igmp2, batadv_ip_mc_check_igmp1)(__VA_ARGS__)
  63
  64 #endif /* < KERNEL_VERSION(5, 1, 0) */
  65
  66
  67 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 15, 0)
  68
  69 #define batadv_softif_slave_add(__dev, __slave_dev, __extack) \
  70         batadv_softif_slave_add(__dev, __slave_dev)
  71
  72 #endif /* < KERNEL_VERSION(4, 15, 0) */
  73
  74
  75 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 0, 0)
  76
  77 static inline int batadv_access_ok(int type, const void __user *p,
  78                                    unsigned long size)
  79 {
  80         return access_ok(type, p, size);
  81 }
  82
  83 #ifdef access_ok
  84 #undef access_ok
  85 #endif
  86
  87 #define access_ok_get(_1, _2, _3 , access_ok_name, ...) access_ok_name
  88 #define access_ok(...) \
  89         access_ok_get(__VA_ARGS__, access_ok3, access_ok2)(__VA_ARGS__)
  90
  91 #define access_ok2(addr, size)  batadv_access_ok(VERIFY_WRITE, (addr), (size))
  92 #define access_ok3(type, addr, size)    batadv_access_ok((type), (addr), (size))
  93
  94 #endif /* < KERNEL_VERSION(5, 0, 0) */
  95
  96 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 4, 0)
  97
  98 #ifndef fallthrough
  99 #if __GNUC__ > 7 && !defined(__CHECKER__)
 100 # define fallthrough                    __attribute__((__fallthrough__))
 101 #else
 102 # define fallthrough                    do {} while (0)  /* fallthrough */
 103 #endif
 104 #endif
 105
 106 #endif /* < KERNEL_VERSION(5, 4, 0) */
 107
 108 /* <DECLARE_EWMA> */
 109
 110 #include <linux/version.h>
 111 #include_next <linux/average.h>
 112
 113 #include <linux/bug.h>
 114
 115 #ifdef DECLARE_EWMA
 116 #undef DECLARE_EWMA
 117 #endif /* DECLARE_EWMA */
 118
 119 /*
 120  * Exponentially weighted moving average (EWMA)
 121  *
 122  * This implements a fixed-precision EWMA algorithm, with both the
 123  * precision and fall-off coefficient determined at compile-time
 124  * and built into the generated helper funtions.
 125  *
 126  * The first argument to the macro is the name that will be used
 127  * for the struct and helper functions.
 128  *
 129  * The second argument, the precision, expresses how many bits are
 130  * used for the fractional part of the fixed-precision values.
 131  *
 132  * The third argument, the weight reciprocal, determines how the
 133  * new values will be weighed vs. the old state, new values will
 134  * get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
 135  * that this parameter must be a power of two for efficiency.
 136  */
 137
 138 #define DECLARE_EWMA(name, _precision, _weight_rcp)                     \
 139         struct ewma_##name {                                            \
 140                 unsigned long internal;                                 \
 141         };                                                              \
 142         static inline void ewma_##name##_init(struct ewma_##name *e)    \
 143         {                                                               \
 144                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 145                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 146                 /*                                                      \
 147                  * Even if you want to feed it just 0/1 you should have \
 148                  * some bits for the non-fractional part...             \
 149                  */                                                     \
 150                 BUILD_BUG_ON((_precision) > 30);                        \
 151                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 152                 e->internal = 0;                                        \
 153         }                                                               \
 154         static inline unsigned long                                     \
 155         ewma_##name##_read(struct ewma_##name *e)                       \
 156         {                                                               \
 157                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 158                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 159                 BUILD_BUG_ON((_precision) > 30);                        \
 160                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 161                 return e->internal >> (_precision);                     \
 162         }                                                               \
 163         static inline void ewma_##name##_add(struct ewma_##name *e,     \
 164                                              unsigned long val)         \
 165         {                                                               \
 166                 unsigned long internal = READ_ONCE(e->internal);        \
 167                 unsigned long weight_rcp = ilog2(_weight_rcp);          \
 168                 unsigned long precision = _precision;                   \
 169                                                                         \
 170                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 171                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 172                 BUILD_BUG_ON((_precision) > 30);                        \
 173                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 174                                                                         \
 175                 WRITE_ONCE(e->internal, internal ?                      \
 176                         (((internal << weight_rcp) - internal) +        \
 177                                 (val << precision)) >> weight_rcp :     \
 178                         (val << precision));                            \
 179         }
 180
 181 /* </DECLARE_EWMA> */