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authorThomas Gleixner <tglx@linutronix.de>2019-11-07 00:55:44 +0300
committerThomas Gleixner <tglx@linutronix.de>2019-11-20 11:40:10 +0300
commit3f186d974826847a07bc7964d79ec4eded475ad9 (patch)
tree99bdae5f1dedc0f361465fae87165eea0598eab4 /include/linux/futex.h
parentaf8cbda2cfcaa5515d61ec500498d46e9a8247e2 (diff)
downloadlinux-3f186d974826847a07bc7964d79ec4eded475ad9.tar.xz
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.h1
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);