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[PATCH 15/19] utrace: don't clear TIF_SYSCALL_TRACE if it is needed by ptrace

TIF_SYSCALL_TRACE should be cleared only if both ptrace and utrace do
not want it, change utrace_reset() to check PT_SYSCALL_TRACE before

Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
 kernel/utrace.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/kernel/utrace.c b/kernel/utrace.c
index daa96b9..a824ac3 100644
--- a/kernel/utrace.c
+++ b/kernel/utrace.c
@@ -697,6 +697,7 @@ static bool utrace_reset(struct task_struct *task, struct utrace *utrace)
 		flags &= UTRACE_EVENT(REAP);
 	} else if (!(flags & UTRACE_EVENT_SYSCALL) &&
+		   !(task->ptrace & PT_SYSCALL_TRACE) &&
 		   test_tsk_thread_flag(task, TIF_SYSCALL_TRACE)) {
 		clear_tsk_thread_flag(task, TIF_SYSCALL_TRACE);

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