linux-kernel - [PATCH tip/core/rcu 4/7] net: sched: Remove broken definitions and un-hide for !LOCKDEP

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Message-Id: <20201105232454.19919-4-paulmck@kernel.org>
Date:   Thu,  5 Nov 2020 15:24:51 -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>, jhs@...atatu.com,
        xiyou.wangcong@...il.com, jiri@...nulli.us,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH tip/core/rcu 4/7] net: sched: Remove broken definitions and un-hide 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 full definitions of the lockdep_tcf_chain_is_locked()
and lockdep_tcf_proto_is_locked() functions to be visible even when
lockdep is not enabled, thus removing the need for the previous empty
functions that were provided in non-lockdep kernels.  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>
--
CC: jhs@...atatu.com
CC: xiyou.wangcong@...il.com
CC: jiri@...nulli.us
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 include/net/sch_generic.h | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index d8fd867..749db62 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -435,7 +435,6 @@ struct tcf_block {
 	struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
 };
 
-#ifdef CONFIG_PROVE_LOCKING
 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
 {
 	return lockdep_is_held(&chain->filter_chain_lock);
@@ -445,17 +444,6 @@ static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
 {
 	return lockdep_is_held(&tp->lock);
 }
-#else
-static inline bool lockdep_tcf_chain_is_locked(struct tcf_block *chain)
-{
-	return true;
-}
-
-static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
-{
-	return true;
-}
-#endif /* #ifdef CONFIG_PROVE_LOCKING */
 
 #define tcf_chain_dereference(p, chain)					\
 	rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
-- 
2.9.5