Commit ae577ea0 authored by Peter Zijlstra's avatar Peter Zijlstra
Browse files

unwind: Add comment to unwind_deferred_task_exit() 



Explain why unwind_deferred_task_exit() exist and its constraints.

Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
Link: https://patch.msgid.link/20250924080118.893367437@infradead.org
parent 52a1ec71

kernel/exit.c

+6 −1
Original line number Diff line number Diff line
@@ -939,7 +939,6 @@ void __noreturn do_exit(long code) 


	tsk->exit_code = code;

	taskstats_exit(tsk, group_dead);

	unwind_deferred_task_exit(tsk);

	trace_sched_process_exit(tsk, group_dead);



	/*
@@ -950,6 +949,12 @@ void __noreturn do_exit(long code) 
	 * gets woken up by child-exit notifications.

	 */

	perf_event_exit_task(tsk);

	/*

	 * PF_EXITING (above) ensures unwind_deferred_request() will no

	 * longer add new unwinds. While exit_mm() (below) will destroy the

	 * abaility to do unwinds. So flush any pending unwinds here.

	 */

	unwind_deferred_task_exit(tsk);



	exit_mm();