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| author | Waiman Long <longman@redhat.com> | 2024-09-09 14:29:05 -0400 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2024-09-10 12:02:33 +0200 |
| commit | d00b83d416e73bc3fa4d21b14bec920e88b70ce6 (patch) | |
| tree | 68909c23e7ef5f4e4f0dabb1a86c85a41271dbdc /kernel/locking/rwsem.c | |
| parent | 39dea484e2bb9066abbc01e2c5e03b6917b0b775 (diff) | |
| download | linux-stable-d00b83d416e73bc3fa4d21b14bec920e88b70ce6.tar.gz linux-stable-d00b83d416e73bc3fa4d21b14bec920e88b70ce6.tar.bz2 linux-stable-d00b83d416e73bc3fa4d21b14bec920e88b70ce6.zip | |
locking/rwsem: Move is_rwsem_reader_owned() and rwsem_owner() under CONFIG_DEBUG_RWSEMS
Both is_rwsem_reader_owned() and rwsem_owner() are currently only used when
CONFIG_DEBUG_RWSEMS is defined. This causes a compilation error with clang
when `make W=1` and CONFIG_WERROR=y:
kernel/locking/rwsem.c:187:20: error: unused function 'is_rwsem_reader_owned' [-Werror,-Wunused-function]
187 | static inline bool is_rwsem_reader_owned(struct rw_semaphore *sem)
| ^~~~~~~~~~~~~~~~~~~~~
kernel/locking/rwsem.c:271:35: error: unused function 'rwsem_owner' [-Werror,-Wunused-function]
271 | static inline struct task_struct *rwsem_owner(struct rw_semaphore *sem)
| ^~~~~~~~~~~
Fix this by moving these two functions under the CONFIG_DEBUG_RWSEMS define.
Reported-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240909182905.161156-1-longman@redhat.com
Diffstat (limited to 'kernel/locking/rwsem.c')
| -rw-r--r-- | kernel/locking/rwsem.c | 22 |
1 files changed, 10 insertions, 12 deletions
diff --git a/kernel/locking/rwsem.c b/kernel/locking/rwsem.c index 33cac79e3994..4b041e9c408f 100644 --- a/kernel/locking/rwsem.c +++ b/kernel/locking/rwsem.c @@ -181,12 +181,21 @@ static inline void rwsem_set_reader_owned(struct rw_semaphore *sem) __rwsem_set_reader_owned(sem, current); } +#ifdef CONFIG_DEBUG_RWSEMS +/* + * Return just the real task structure pointer of the owner + */ +static inline struct task_struct *rwsem_owner(struct rw_semaphore *sem) +{ + return (struct task_struct *) + (atomic_long_read(&sem->owner) & ~RWSEM_OWNER_FLAGS_MASK); +} + /* * Return true if the rwsem is owned by a reader. */ static inline bool is_rwsem_reader_owned(struct rw_semaphore *sem) { -#ifdef CONFIG_DEBUG_RWSEMS /* * Check the count to see if it is write-locked. */ @@ -194,11 +203,9 @@ static inline bool is_rwsem_reader_owned(struct rw_semaphore *sem) if (count & RWSEM_WRITER_MASK) return false; -#endif return rwsem_test_oflags(sem, RWSEM_READER_OWNED); } -#ifdef CONFIG_DEBUG_RWSEMS /* * With CONFIG_DEBUG_RWSEMS configured, it will make sure that if there * is a task pointer in owner of a reader-owned rwsem, it will be the @@ -266,15 +273,6 @@ static inline bool rwsem_write_trylock(struct rw_semaphore *sem) } /* - * Return just the real task structure pointer of the owner - */ -static inline struct task_struct *rwsem_owner(struct rw_semaphore *sem) -{ - return (struct task_struct *) - (atomic_long_read(&sem->owner) & ~RWSEM_OWNER_FLAGS_MASK); -} - -/* * Return the real task structure pointer of the owner and the embedded * flags in the owner. pflags must be non-NULL. */ |