[INET]: Use BUILD_BUG_ON in inet_timewait_sock.c checks

Make the INET_TWDR_TWKILL_SLOTS vs sizeof(twdr->thread_slots)
check nicer.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 4 deletions

diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c
index a60b99e0ebdc..d43e787031a4 100644
--- a/net/ipv4/inet_timewait_sock.c
+++ b/net/ipv4/inet_timewait_sock.c
@@ -194,16 +194,14 @@ out:
 
 EXPORT_SYMBOL_GPL(inet_twdr_hangman);
 
-extern void twkill_slots_invalid(void);
-
 void inet_twdr_twkill_work(struct work_struct *work)
 {
         struct inet_timewait_death_row *twdr =
                 container_of(work, struct inet_timewait_death_row, twkill_work);
         int i;
 
-        if ((INET_TWDR_TWKILL_SLOTS - 1) > (sizeof(twdr->thread_slots) * 8))
-                twkill_slots_invalid();
+        BUILD_BUG_ON((INET_TWDR_TWKILL_SLOTS - 1) >
+                        (sizeof(twdr->thread_slots) * 8));
 
         while (twdr->thread_slots) {
                 spin_lock_bh(&twdr->death_lock);