net-tcp_bbr: v3: change u64 to unsigned long for bytes in bbr_tso_segs_generic

This change addresses a build failure on 32-bit systems due to undefined division symbols:

arm:
ERROR: modpost: "__aeabi_uldivmod" [net/ipv4/tcp_bbr.ko] undefined!
ERROR: modpost: "__aeabi_ldivmod" [net/ipv4/tcp_bbr.ko] undefined!

x86, mips, ppc:
ERROR: modpost: "__udivdi3" [net/ipv4/tcp_bbr.ko] undefined!
ERROR: modpost: "__divdi3" [net/ipv4/tcp_bbr.ko] undefined!

Since `sk->sk_pacing_rate` is already an `unsigned long`, the `bytes` variable is
updated to `unsigned long` to resolve these division issues and ensure compatibility
across both 32-bit and 64-bit platforms.

Signed-off-by: Chen Minqiang <[email protected]>

Author: ptpt52

net/ipv4/tcp_bbr.c

@@ -481,7 +481,7 @@ static u32 bbr_tso_segs_generic(struct sock *sk, unsigned int mss_now,
 {
 	struct bbr *bbr = inet_csk_ca(sk);
 	u32 segs, r;
-	u64 bytes;
+	unsigned long bytes;
 
 	/* Budget a TSO/GSO burst size allowance based on bw (pacing_rate). */
 	bytes = sk->sk_pacing_rate >> sk->sk_pacing_shift;