Following David Laight's suggestion, simplify the macro definitions by removing the unnecessary 'fmt' argument and using no_printk(__VA_ARGS__) directly. Verification with .lst files under -O2 confirms that the compiler successfully performs "dead code elimination". Even when variables (like char buf[] in nfsfh.c) or static helper functions (like nlmdbg_cookie2a() in svclock.c) are declared without #ifdef, they are completely optimized out (no stack allocation, no symbol references in the final executable) as they are only referenced within no_printk(). Suggested-by: Andrew Lunn Suggested-by: David Laight Signed-off-by: Sean Chang --- v2: - Follow reversed xmas tree order for variables in svc_rdma_transport.c as requested by Andy Shevchenko. - Polish commit message: use dprintk() and remove redundant file list. - Correct the technical claim about dprintk() type checking. fs/lockd/svclock.c | 7 ------- fs/nfsd/nfsfh.c | 8 +++----- include/linux/sunrpc/debug.h | 8 ++------ net/sunrpc/xprtrdma/svc_rdma_transport.c | 25 +++++++++++------------- 4 files changed, 16 insertions(+), 32 deletions(-) diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c index ee23f5802af1..9b978a087b3c 100644 --- a/fs/lockd/svclock.c +++ b/fs/lockd/svclock.c @@ -47,7 +47,6 @@ static const struct rpc_call_ops nlmsvc_grant_ops; static LIST_HEAD(nlm_blocked); static DEFINE_SPINLOCK(nlm_blocked_lock); -#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) static const char *nlmdbg_cookie2a(const struct nlm_cookie *cookie) { /* @@ -74,12 +73,6 @@ static const char *nlmdbg_cookie2a(const struct nlm_cookie *cookie) return buf; } -#else -static inline const char *nlmdbg_cookie2a(const struct nlm_cookie *cookie) -{ - return "???"; -} -#endif /* * Insert a blocked lock into the global list diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c index 68b629fbaaeb..91514326d1b4 100644 --- a/fs/nfsd/nfsfh.c +++ b/fs/nfsd/nfsfh.c @@ -105,12 +105,10 @@ static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp, { /* Check if the request originated from a secure port. */ if (rqstp && !nfsd_originating_port_ok(rqstp, cred, exp)) { - if (IS_ENABLED(CONFIG_SUNRPC_DEBUG)) { - char buf[RPC_MAX_ADDRBUFLEN]; + char buf[RPC_MAX_ADDRBUFLEN]; - dprintk("nfsd: request from insecure port %s!\n", - svc_print_addr(rqstp, buf, sizeof(buf))); - } + dprintk("nfsd: request from insecure port %s!\n", + svc_print_addr(rqstp, buf, sizeof(buf))); return nfserr_perm; } diff --git a/include/linux/sunrpc/debug.h b/include/linux/sunrpc/debug.h index ab61bed2f7af..f6f2a106eeaf 100644 --- a/include/linux/sunrpc/debug.h +++ b/include/linux/sunrpc/debug.h @@ -38,8 +38,6 @@ extern unsigned int nlm_debug; do { \ ifdebug(fac) \ __sunrpc_printk(fmt, ##__VA_ARGS__); \ - else \ - no_printk(fmt, ##__VA_ARGS__); \ } while (0) # define dfprintk_rcu(fac, fmt, ...) \ @@ -48,15 +46,13 @@ do { \ rcu_read_lock(); \ __sunrpc_printk(fmt, ##__VA_ARGS__); \ rcu_read_unlock(); \ - } else { \ - no_printk(fmt, ##__VA_ARGS__); \ } \ } while (0) #else # define ifdebug(fac) if (0) -# define dfprintk(fac, fmt, ...) no_printk(fmt, ##__VA_ARGS__) -# define dfprintk_rcu(fac, fmt, ...) no_printk(fmt, ##__VA_ARGS__) +# define dfprintk(fac, ...) no_printk(__VA_ARGS__) +# define dfprintk_rcu(fac, ...) no_printk(__VA_ARGS__) #endif /* diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c index f2d72181a6fe..0759444bda50 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_transport.c +++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c @@ -413,6 +413,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) struct rpcrdma_connect_private pmsg; struct ib_qp_init_attr qp_attr; struct ib_device *dev; + struct sockaddr *sap; int ret = 0; listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); @@ -559,20 +560,16 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) goto errout; } - if (IS_ENABLED(CONFIG_SUNRPC_DEBUG)) { - struct sockaddr *sap; - - dprintk("svcrdma: new connection accepted on device %s:\n", dev->name); - sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; - dprintk(" local address : %pIS:%u\n", sap, rpc_get_port(sap)); - sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; - dprintk(" remote address : %pIS:%u\n", sap, rpc_get_port(sap)); - dprintk(" max_sge : %d\n", newxprt->sc_max_send_sges); - dprintk(" sq_depth : %d\n", newxprt->sc_sq_depth); - dprintk(" rdma_rw_ctxs : %d\n", ctxts); - dprintk(" max_requests : %d\n", newxprt->sc_max_requests); - dprintk(" ord : %d\n", conn_param.initiator_depth); - } + dprintk("svcrdma: new connection accepted on device %s:\n", dev->name); + sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; + dprintk(" local address : %pIS:%u\n", sap, rpc_get_port(sap)); + sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; + dprintk(" remote address : %pIS:%u\n", sap, rpc_get_port(sap)); + dprintk(" max_sge : %d\n", newxprt->sc_max_send_sges); + dprintk(" sq_depth : %d\n", newxprt->sc_sq_depth); + dprintk(" rdma_rw_ctxs : %d\n", ctxts); + dprintk(" max_requests : %d\n", newxprt->sc_max_requests); + dprintk(" ord : %d\n", conn_param.initiator_depth); return &newxprt->sc_xprt; -- 2.34.1