diff options
Diffstat (limited to 'include/linux/unwind_deferred.h')
| -rw-r--r-- | include/linux/unwind_deferred.h | 52 |
1 files changed, 25 insertions, 27 deletions
diff --git a/include/linux/unwind_deferred.h b/include/linux/unwind_deferred.h index 26122d00708a..bc7ae7d21900 100644 --- a/include/linux/unwind_deferred.h +++ b/include/linux/unwind_deferred.h @@ -6,16 +6,6 @@ #include <linux/unwind_user.h> #include <linux/unwind_deferred_types.h> -struct unwind_work; - -typedef void (*unwind_callback_t)(struct unwind_work *work, struct unwind_stacktrace *trace, u64 cookie); - -struct unwind_work { - struct list_head list; - unwind_callback_t func; - int bit; -}; - #ifdef CONFIG_UNWIND_USER enum { @@ -44,22 +34,22 @@ void unwind_deferred_task_exit(struct task_struct *task); static __always_inline void unwind_reset_info(void) { struct unwind_task_info *info = ¤t->unwind_info; - unsigned long bits; + unsigned long bits = atomic_long_read(&info->unwind_mask); /* Was there any unwinding? */ - if (unlikely(info->unwind_mask)) { - bits = info->unwind_mask; - do { - /* Is a task_work going to run again before going back */ - if (bits & UNWIND_PENDING) - return; - } while (!try_cmpxchg(&info->unwind_mask, &bits, 0UL)); - current->unwind_info.id.id = 0; - - if (unlikely(info->cache)) { - info->cache->nr_entries = 0; - info->cache->unwind_completed = 0; - } + if (likely(!bits)) + return; + + do { + /* Is a task_work going to run again before going back */ + if (bits & UNWIND_PENDING) + return; + } while (!atomic_long_try_cmpxchg(&info->unwind_mask, &bits, 0UL)); + current->unwind_info.id.id = 0; + + if (unlikely(info->cache)) { + info->cache->nr_entries = 0; + info->cache->unwind_completed = 0; } } @@ -68,9 +58,17 @@ static __always_inline void unwind_reset_info(void) static inline void unwind_task_init(struct task_struct *task) {} static inline void unwind_task_free(struct task_struct *task) {} -static inline int unwind_user_faultable(struct unwind_stacktrace *trace) { return -ENOSYS; } -static inline int unwind_deferred_init(struct unwind_work *work, unwind_callback_t func) { return -ENOSYS; } -static inline int unwind_deferred_request(struct unwind_work *work, u64 *timestamp) { return -ENOSYS; } +static inline int unwind_user_faultable(struct unwind_stacktrace *trace) +{ return -ENOSYS; } + +static inline int +unwind_deferred_init(struct unwind_work *work, unwind_callback_t func) +{ return -ENOSYS; } + +static inline int +unwind_deferred_request(struct unwind_work *work, u64 *timestamp) +{ return -ENOSYS; } + static inline void unwind_deferred_cancel(struct unwind_work *work) {} static inline void unwind_deferred_task_exit(struct task_struct *task) {} |