From: Linus Lüssing &lt;linus.luessing(a)web.de&gt; On some architectures test_bit() can return other values than 0 or 1: With a generic x86 OpenWrt image in a kvm setup (batadv_)test_bit() frequently returns -1 for me, leading to batadv_iv_ogm_update_seqnos() wrongly signaling a protected seqno window. This patch tries to fix this issue by making batadv_test_bit() return 0 or 1 only. Signed-off-by: Linus Lüssing &lt;linus.luessing(a)web.de&gt; Acked-by: Sven Eckelmann &lt;sven(a)narfation.org&gt; Signed-off-by: Antonio Quartulli &lt;ordex(a)autistici.org&gt; --- net/batman-adv/bitarray.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/net/batman-adv/bitarray.h b/net/batman-adv/bitarray.h index a081ce1..cebaae7 100644 --- a/net/batman-adv/bitarray.h +++ b/net/batman-adv/bitarray.h @@ -20,8 +20,8 @@ #ifndef _NET_BATMAN_ADV_BITARRAY_H_ #define _NET_BATMAN_ADV_BITARRAY_H_ -/* returns true if the corresponding bit in the given seq_bits indicates true - * and curr_seqno is within range of last_seqno +/* Returns 1 if the corresponding bit in the given seq_bits indicates true + * and curr_seqno is within range of last_seqno. Otherwise returns 0. */ static inline int batadv_test_bit(const unsigned long *seq_bits, uint32_t last_seqno, uint32_t curr_seqno) @@ -32,7 +32,7 @@ static inline int batadv_test_bit(const unsigned long *seq_bits, if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE) return 0; else - return test_bit(diff, seq_bits); + return test_bit(diff, seq_bits) != 0; } /* turn corresponding bit on, so we can remember that we got the packet */ -- 1.7.12