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linux-sg2042
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tcp: Avoid preprocessor directives in tracepoint macro args 

Using a preprocessor directive to check for CONFIG_IPV6 in the middle of
a DECLARE_EVENT_CLASS macro's arg list causes sparse to report a series
of errors:

./include/trace/events/tcp.h:68:1: error: directive in argument list
./include/trace/events/tcp.h:75:1: error: directive in argument list
./include/trace/events/tcp.h:144:1: error: directive in argument list
./include/trace/events/tcp.h:151:1: error: directive in argument list
./include/trace/events/tcp.h:216:1: error: directive in argument list
./include/trace/events/tcp.h:223:1: error: directive in argument list
./include/trace/events/tcp.h:274:1: error: directive in argument list
./include/trace/events/tcp.h:281:1: error: directive in argument list

Once sparse finds an error, it stops printing warnings for the file it
is checking. This masks any sparse warnings that would normally be
reported for the core TCP code.

Instead, handle the preprocessor conditionals in a couple of auxiliary
macros. This also has the benefit of reducing duplicate code.

Cc: David Ahern <dsahern@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mat Martineau 2017-12-21 10:29:09 -08:00 committed by David S. Miller
parent 3a33a19bf8
commit 6a6b0b9914
1 changed files with 37 additions and 60 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

97
include/trace/events/tcp.h
View File

@ -25,6 +25,35 @@
tcp_state_name(TCP_CLOSING), \
tcp_state_name(TCP_NEW_SYN_RECV))
#define TP_STORE_V4MAPPED(__entry, saddr, daddr) \
do { \
struct in6_addr *pin6; \
\
pin6 = (struct in6_addr *)__entry->saddr_v6; \
ipv6_addr_set_v4mapped(saddr, pin6); \
pin6 = (struct in6_addr *)__entry->daddr_v6; \
ipv6_addr_set_v4mapped(daddr, pin6); \
} while (0)
#if IS_ENABLED(CONFIG_IPV6)
#define TP_STORE_ADDRS(__entry, saddr, daddr, saddr6, daddr6) \
do { \
if (sk->sk_family == AF_INET6) { \
struct in6_addr *pin6; \
\
pin6 = (struct in6_addr *)__entry->saddr_v6; \
*pin6 = saddr6; \
pin6 = (struct in6_addr *)__entry->daddr_v6; \
*pin6 = daddr6; \
} else { \
TP_STORE_V4MAPPED(__entry, saddr, daddr); \
} \
} while (0)
#else
#define TP_STORE_ADDRS(__entry, saddr, daddr, saddr6, daddr6) \
TP_STORE_V4MAPPED(__entry, saddr, daddr)
#endif
/*
* tcp event with arguments sk and skb
*
@ -50,7 +79,6 @@ DECLARE_EVENT_CLASS(tcp_event_sk_skb,
TP_fast_assign(
struct inet_sock *inet = inet_sk(sk);
struct in6_addr *pin6;
__be32 *p32;
__entry->skbaddr = skb;
@ -65,20 +93,8 @@ DECLARE_EVENT_CLASS(tcp_event_sk_skb,
p32 = (__be32 *) __entry->daddr;
*p32 = inet->inet_daddr;
#if IS_ENABLED(CONFIG_IPV6)
if (sk->sk_family == AF_INET6) {
pin6 = (struct in6_addr *)__entry->saddr_v6;
*pin6 = sk->sk_v6_rcv_saddr;
pin6 = (struct in6_addr *)__entry->daddr_v6;
*pin6 = sk->sk_v6_daddr;
} else
#endif
{
pin6 = (struct in6_addr *)__entry->saddr_v6;
ipv6_addr_set_v4mapped(inet->inet_saddr, pin6);
pin6 = (struct in6_addr *)__entry->daddr_v6;
ipv6_addr_set_v4mapped(inet->inet_daddr, pin6);
}
TP_STORE_ADDRS(__entry, inet->inet_saddr, inet->inet_daddr,
sk->sk_v6_rcv_saddr, sk->sk_v6_daddr);
),
TP_printk("sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c",
@ -127,7 +143,6 @@ DECLARE_EVENT_CLASS(tcp_event_sk,
TP_fast_assign(
struct inet_sock *inet = inet_sk(sk);
struct in6_addr *pin6;
__be32 *p32;
__entry->skaddr = sk;
@ -141,20 +156,8 @@ DECLARE_EVENT_CLASS(tcp_event_sk,
p32 = (__be32 *) __entry->daddr;
*p32 = inet->inet_daddr;
#if IS_ENABLED(CONFIG_IPV6)
if (sk->sk_family == AF_INET6) {
pin6 = (struct in6_addr *)__entry->saddr_v6;
*pin6 = sk->sk_v6_rcv_saddr;
pin6 = (struct in6_addr *)__entry->daddr_v6;
*pin6 = sk->sk_v6_daddr;
} else
#endif
{
pin6 = (struct in6_addr *)__entry->saddr_v6;
ipv6_addr_set_v4mapped(inet->inet_saddr, pin6);
pin6 = (struct in6_addr *)__entry->daddr_v6;
ipv6_addr_set_v4mapped(inet->inet_daddr, pin6);
}
TP_STORE_ADDRS(__entry, inet->inet_saddr, inet->inet_daddr,
sk->sk_v6_rcv_saddr, sk->sk_v6_daddr);
),
TP_printk("sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c",
@ -197,7 +200,6 @@ TRACE_EVENT(tcp_set_state,
TP_fast_assign(
struct inet_sock *inet = inet_sk(sk);
struct in6_addr *pin6;
__be32 *p32;
__entry->skaddr = sk;
@ -213,20 +215,8 @@ TRACE_EVENT(tcp_set_state,
p32 = (__be32 *) __entry->daddr;
*p32 = inet->inet_daddr;
#if IS_ENABLED(CONFIG_IPV6)
if (sk->sk_family == AF_INET6) {
pin6 = (struct in6_addr *)__entry->saddr_v6;
*pin6 = sk->sk_v6_rcv_saddr;
pin6 = (struct in6_addr *)__entry->daddr_v6;
*pin6 = sk->sk_v6_daddr;
} else
#endif
{
pin6 = (struct in6_addr *)__entry->saddr_v6;
ipv6_addr_set_v4mapped(inet->inet_saddr, pin6);
pin6 = (struct in6_addr *)__entry->daddr_v6;
ipv6_addr_set_v4mapped(inet->inet_daddr, pin6);
}
TP_STORE_ADDRS(__entry, inet->inet_saddr, inet->inet_daddr,
sk->sk_v6_rcv_saddr, sk->sk_v6_daddr);
),
TP_printk("sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c oldstate=%s newstate=%s",
@ -256,7 +246,6 @@ TRACE_EVENT(tcp_retransmit_synack,
TP_fast_assign(
struct inet_request_sock *ireq = inet_rsk(req);
struct in6_addr *pin6;
__be32 *p32;
__entry->skaddr = sk;
@ -271,20 +260,8 @@ TRACE_EVENT(tcp_retransmit_synack,
p32 = (__be32 *) __entry->daddr;
*p32 = ireq->ir_rmt_addr;
#if IS_ENABLED(CONFIG_IPV6)
if (sk->sk_family == AF_INET6) {
pin6 = (struct in6_addr *)__entry->saddr_v6;
*pin6 = ireq->ir_v6_loc_addr;
pin6 = (struct in6_addr *)__entry->daddr_v6;
*pin6 = ireq->ir_v6_rmt_addr;
} else
#endif
{
pin6 = (struct in6_addr *)__entry->saddr_v6;
ipv6_addr_set_v4mapped(ireq->ir_loc_addr, pin6);
pin6 = (struct in6_addr *)__entry->daddr_v6;
ipv6_addr_set_v4mapped(ireq->ir_rmt_addr, pin6);
}
TP_STORE_ADDRS(__entry, ireq->ir_loc_addr, ireq->ir_rmt_addr,
ireq->ir_v6_loc_addr, ireq->ir_v6_rmt_addr);
),
TP_printk("sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c",