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| author |   Thomas Gleixner <tglx@linutronix.de> | 2019-11-06 22:55:44 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-11-20 09:40:10 +0100 |
| commit | 3f186d974826847a07bc7964d79ec4eded475ad9 (patch) | |
| tree | 99bdae5f1dedc0f361465fae87165eea0598eab4 /include/linux/futex.h | |
| parent | futex: Provide state handling for exec() as well (diff) | |
| download | wireguard-linux-3f186d974826847a07bc7964d79ec4eded475ad9.tar.xz wireguard-linux-3f186d974826847a07bc7964d79ec4eded475ad9.zip | |
futex: Add mutex around futex exit
The mutex will be used in subsequent changes to replace the busy looping of
a waiter when the futex owner is currently executing the exit cleanup to
prevent a potential live lock.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20191106224556.845798895@linutronix.de
Diffstat (limited to 'include/linux/futex.h')
| -rw-r--r-- | include/linux/futex.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/futex.h b/include/linux/futex.h index 9f2792427d64..5cc3fed27d4c 100644 --- a/include/linux/futex.h +++ b/include/linux/futex.h @@ -65,6 +65,7 @@ static inline void futex_init_task(struct task_struct *tsk) INIT_LIST_HEAD(&tsk->pi_state_list); tsk->pi_state_cache = NULL; tsk->futex_state = FUTEX_STATE_OK; + mutex_init(&tsk->futex_exit_mutex); } void futex_exit_recursive(struct task_struct *tsk); |