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-rw-r--r--include/linux/tracehook.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h
index 51bd91d..48c597d 100644
--- a/include/linux/tracehook.h
+++ b/include/linux/tracehook.h
@@ -49,6 +49,7 @@
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/security.h>
+#include <linux/task_work.h>
struct linux_binprm;
/*
@@ -165,8 +166,10 @@ static inline void tracehook_signal_handler(int sig, siginfo_t *info,
*/
static inline void set_notify_resume(struct task_struct *task)
{
+#ifdef TIF_NOTIFY_RESUME
if (!test_and_set_tsk_thread_flag(task, TIF_NOTIFY_RESUME))
kick_process(task);
+#endif
}
/**
@@ -184,6 +187,14 @@ static inline void set_notify_resume(struct task_struct *task)
*/
static inline void tracehook_notify_resume(struct pt_regs *regs)
{
+ /*
+ * The caller just cleared TIF_NOTIFY_RESUME. This barrier
+ * pairs with task_work_add()->set_notify_resume() after
+ * hlist_add_head(task->task_works);
+ */
+ smp_mb__after_clear_bit();
+ if (unlikely(!hlist_empty(&current->task_works)))
+ task_work_run();
}
#endif /* TIF_NOTIFY_RESUME */