linux-kernel - [PATCH tip/core/rcu 3/7] net: Un-hide lockdep_sock_is

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Date:   Thu,  5 Nov 2020 15:24:50 -0800
From:   paulmck@...nel.org
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org,
        jiangshanlai@...il.com, akpm@...ux-foundation.org,
        mathieu.desnoyers@...icios.com, josh@...htriplett.org,
        tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com, joel@...lfernandes.org,
        Jakub Kicinski <kuba@...nel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH tip/core/rcu 3/7] net: Un-hide lockdep_sock_is_held() for !LOCKDEP

From: Jakub Kicinski <kuba@...nel.org>

Currently, variables used only within lockdep expressions are flagged
as unused, requiring that these variables' declarations be decorated
with either #ifdef or __maybe_unused.  This results in ugly code.
This commit therefore causes the lockdep_sock_is_held() function to be
visible even when lockdep is not enabled, thus removing the need for
these decorations.  This approach further relies on dead-code elimination
to remove any references to functions or variables that are not available
in non-lockdep kernels.

Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 include/net/sock.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index a5c6ae7..198d548 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1566,13 +1566,11 @@ do {									\
 	lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0);	\
 } while (0)
 
-#ifdef CONFIG_LOCKDEP
 static inline bool lockdep_sock_is_held(const struct sock *sk)
 {
 	return lockdep_is_held(&sk->sk_lock) ||
 	       lockdep_is_held(&sk->sk_lock.slock);
 }
-#endif
 
 void lock_sock_nested(struct sock *sk, int subclass);
 
-- 
2.9.5