No functional changes. Add the new helper, ptrace_set_syscall_trace(), which should be used to set/clear TIF_SYSCALL_TRACE in ptrace code. Currently it does nothing more.
Signed-off-by: Oleg Nesterov oleg@redhat.com --- kernel/ptrace.c | 15 ++++++++++----- 1 files changed, 10 insertions(+), 5 deletions(-)
diff --git a/kernel/ptrace.c b/kernel/ptrace.c index 0b2aba5..b6fd922 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -37,6 +37,14 @@ static void ptrace_signal_wake_up(struct task_struct *p, int quiescent) kick_process(p); }
+static void ptrace_set_syscall_trace(struct task_struct *p, bool on) +{ + if (on) + set_tsk_thread_flag(p, TIF_SYSCALL_TRACE); + else + clear_tsk_thread_flag(p, TIF_SYSCALL_TRACE); +} + /* * ptrace a task: make the debugger its new parent and * move it to the ptrace list. @@ -364,7 +372,7 @@ static int ptrace_detach(struct task_struct *child, unsigned int data)
/* Architecture-specific hardware disable .. */ ptrace_disable(child); - clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); + ptrace_set_syscall_trace(child, false);
write_lock_irq(&tasklist_lock); /* @@ -551,10 +559,7 @@ static int ptrace_resume(struct task_struct *child, long request, if (!valid_signal(data)) return -EIO;
- if (request == PTRACE_SYSCALL) - set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); - else - clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); + ptrace_set_syscall_trace(child, request == PTRACE_SYSCALL);
#ifdef TIF_SYSCALL_EMU if (request == PTRACE_SYSEMU || request == PTRACE_SYSEMU_SINGLESTEP)