From 474e59b476b3390ef9f730515439f21640b61623 Mon Sep 17 00:00:00 2001 From: Paul E. McKenney Date: Tue, 7 Aug 2018 14:34:44 -0700 Subject: rcutorture: Check GP completion at stutter end The rcu_torture_writer() function invokes stutter_wait() at the end of each writer pass, which occasionally blocks for an extended time period in order to ensure that RCU can handle intermittent loads. But part of handling a busy period is invoking all the callbacks before the end of the idle period induced by stutter_wait(). This commit therefore adds a return value to stutter_wait() indicating whether stutter_wait() actually waited. In addition, this commit causes rcu_torture_writer() to test this value and if set, checks that all the elements of the rcu_tortures[] array have been freed up. Signed-off-by: Paul E. McKenney --- kernel/torture.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'kernel/torture.c') diff --git a/kernel/torture.c b/kernel/torture.c index 1ac24a826589..17d91f5fba2a 100644 --- a/kernel/torture.c +++ b/kernel/torture.c @@ -573,7 +573,7 @@ static int stutter; * Block until the stutter interval ends. This must be called periodically * by all running kthreads that need to be subject to stuttering. */ -void stutter_wait(const char *title) +bool stutter_wait(const char *title) { int spt; @@ -590,6 +590,7 @@ void stutter_wait(const char *title) } torture_shutdown_absorb(title); } + return !!spt; } EXPORT_SYMBOL_GPL(stutter_wait); -- cgit v1.2.3-55-g7522