linux-kernel - [PATCH 3/3] lockdep: Convert some users to const

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Date:   Wed, 17 Jan 2018 07:14:14 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] lockdep: Convert some users to const

From: Matthew Wilcox <mawilcox@...rosoft.com>

These users of lockdep_is_held() either wanted lockdep_is_held to
take a const pointer, or would benefit from providing a const pointer.

Signed-off-by: Matthew Wilcox <mawilcox@...rosoft.com>
---
 include/linux/backing-dev.h | 2 +-
 include/linux/srcu.h        | 4 ++--
 include/net/sock.h          | 4 +---
 3 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index e54e7e0033eb..3e4ce54d84ab 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -332,7 +332,7 @@ static inline bool inode_to_wb_is_valid(struct inode *inode)
  * holding either @inode->i_lock, @inode->i_mapping->tree_lock, or the
  * associated wb's list_lock.
  */
-static inline struct bdi_writeback *inode_to_wb(struct inode *inode)
+static inline struct bdi_writeback *inode_to_wb(const struct inode *inode)
 {
 #ifdef CONFIG_LOCKDEP
 	WARN_ON_ONCE(debug_locks &&
diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index 62be8966e837..33c1c698df09 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -92,7 +92,7 @@ void synchronize_srcu(struct srcu_struct *sp);
  * relies on normal RCU, it can be called from the CPU which
  * is in the idle loop from an RCU point of view or offline.
  */
-static inline int srcu_read_lock_held(struct srcu_struct *sp)
+static inline int srcu_read_lock_held(const struct srcu_struct *sp)
 {
 	if (!debug_lockdep_rcu_enabled())
 		return 1;
@@ -101,7 +101,7 @@ static inline int srcu_read_lock_held(struct srcu_struct *sp)
 
 #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
 
-static inline int srcu_read_lock_held(struct srcu_struct *sp)
+static inline int srcu_read_lock_held(const struct srcu_struct *sp)
 {
 	return 1;
 }
diff --git a/include/net/sock.h b/include/net/sock.h
index 7a7b14e9628a..c4a424fe6fdd 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1445,10 +1445,8 @@ do {									\
 } while (0)
 
 #ifdef CONFIG_LOCKDEP
-static inline bool lockdep_sock_is_held(const struct sock *csk)
+static inline bool lockdep_sock_is_held(const struct sock *sk)
 {
-	struct sock *sk = (struct sock *)csk;
-
 	return lockdep_is_held(&sk->sk_lock) ||
 	       lockdep_is_held(&sk->sk_lock.slock);
 }
-- 
2.15.1