The longterm stable kernels 4.4.x and 4.9.x were missing the linux/prandom.h for a long time but the commit c0842fbc1b18 ("random32: move the pseudo-random 32-bit definitions to prandom.h") was recently backported. Due to this change, it was no longer possible for batman-adv to find the prandom_u32_max definition. This resulted in a build error:

net/batman-adv/bat_iv_ogm.c:284:18: error: undefined identifier 'prandom_u32_max' net/batman-adv/bat_iv_ogm.c:292:43: error: undefined identifier 'prandom_u32_max' net/batman-adv/bat_iv_ogm.c: In function ‘batadv_iv_ogm_emit_send_time’: net/batman-adv/bat_iv_ogm.c:284:11: error: implicit declaration of function ‘prandom_u32_max’ [-Werror=implicit-function-declaration] msecs += prandom_u32_max(2 * BATADV_JITTER);

Signed-off-by: Sven Eckelmann sven@narfation.org --- compat-include/linux/prandom.h | 2 ++ 1 file changed, 2 insertions(+)

diff --git a/compat-include/linux/prandom.h b/compat-include/linux/prandom.h index 2863a57d..9d30d2d9 100644 --- a/compat-include/linux/prandom.h +++ b/compat-include/linux/prandom.h @@ -12,6 +12,8 @@

#include <linux/version.h> #if LINUX_VERSION_IS_GEQ(5, 8, 1) || \ + (LINUX_VERSION_IS_GEQ(4, 4, 233) && LINUX_VERSION_IS_LESS(4, 5, 0)) || \ + (LINUX_VERSION_IS_GEQ(4, 9, 233) && LINUX_VERSION_IS_LESS(4, 10, 0)) || \ (LINUX_VERSION_IS_GEQ(4, 14, 193) && LINUX_VERSION_IS_LESS(4, 15, 0)) || \ (LINUX_VERSION_IS_GEQ(4, 19, 138) && LINUX_VERSION_IS_LESS(4, 20, 0)) || \ (LINUX_VERSION_IS_GEQ(5, 4, 57) && LINUX_VERSION_IS_LESS(5, 5, 0)) || \