linux-kernel - [PATCH] filelock: always define for_each_file

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Date: Mon, 12 Feb 2024 07:24:05 -0500
From: Jeff Layton <jlayton@...nel.org>
To: Christian Brauner <brauner@...nel.org>
Cc: Arnd Bergmann <arnd@...nel.org>, Tom Talpey <tom@...pey.com>, 
 Luca Vizzarro <Luca.Vizzarro@....com>, Chuck Lever <chuck.lever@...cle.com>, 
 Alexander Aring <aahringo@...hat.com>, linux-kernel@...r.kernel.org, 
 kernel test robot <lkp@...el.com>, Jeff Layton <jlayton@...nel.org>
Subject: [PATCH] filelock: always define for_each_file_lock()

..and eliminate the stub version when CONFIG_FILE_LOCKING is disabled.
This silences the following warning that crept in recently:

fs/ceph/locks.c: In function 'ceph_count_locks':
fs/ceph/locks.c:380:27: error: unused variable 'lock' [-Werror=unused-variable]
  380 |         struct file_lock *lock;

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202402062210.3YyBVGF1-lkp@intel.com/
Fixes: 75cabec0111b ("filelock: add some new helper functions")
Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 include/linux/filelock.h | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/include/linux/filelock.h b/include/linux/filelock.h
index aabd4bdf7eba..daee999d05f3 100644
--- a/include/linux/filelock.h
+++ b/include/linux/filelock.h
@@ -180,9 +180,6 @@ static inline void locks_wake_up(struct file_lock *fl)
 	wake_up(&fl->c.flc_wait);
 }
 
-/* for walking lists of file_locks linked by fl_list */
-#define for_each_file_lock(_fl, _head)	list_for_each_entry(_fl, _head, c.flc_list)
-
 /* fs/locks.c */
 void locks_free_lock_context(struct inode *inode);
 void locks_free_lock(struct file_lock *fl);
@@ -283,8 +280,6 @@ static inline void locks_wake_up(struct file_lock *fl)
 {
 }
 
-#define for_each_file_lock(_fl, _head)	while(false)
-
 static inline void
 locks_free_lock_context(struct inode *inode)
 {
@@ -414,6 +409,9 @@ locks_inode_context(const struct inode *inode)
 
 #endif /* !CONFIG_FILE_LOCKING */
 
+/* for walking lists of file_locks linked by fl_list */
+#define for_each_file_lock(_fl, _head)	list_for_each_entry(_fl, _head, c.flc_list)
+
 static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl)
 {
 	return locks_lock_inode_wait(file_inode(filp), fl);

---
base-commit: 292fcaa1f937345cb65f3af82a1ee6692c8df9eb
change-id: 20240212-flsplit3-174effe3675a

Best regards,
-- 
Jeff Layton <jlayton@...nel.org>