From 6932689e4145f545062ca8c86cf76f38854d63d0 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Wed, 7 Nov 2018 14:16:57 -0800 Subject: livepatch: Replace synchronize_sched() with synchronize_rcu() Now that synchronize_rcu() waits for preempt-disable regions of code as well as RCU read-side critical sections, synchronize_sched() can be replaced by synchronize_rcu(). This commit therefore makes this change, even though it is but a comment. Signed-off-by: Paul E. McKenney --- kernel/livepatch/patch.c | 4 ++-- kernel/livepatch/transition.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) (limited to 'kernel/livepatch') diff --git a/kernel/livepatch/patch.c b/kernel/livepatch/patch.c index 82d584225dc6..7702cb4064fc 100644 --- a/kernel/livepatch/patch.c +++ b/kernel/livepatch/patch.c @@ -61,7 +61,7 @@ static void notrace klp_ftrace_handler(unsigned long ip, ops = container_of(fops, struct klp_ops, fops); /* - * A variant of synchronize_sched() is used to allow patching functions + * A variant of synchronize_rcu() is used to allow patching functions * where RCU is not watching, see klp_synchronize_transition(). */ preempt_disable_notrace(); @@ -72,7 +72,7 @@ static void notrace klp_ftrace_handler(unsigned long ip, /* * func should never be NULL because preemption should be disabled here * and unregister_ftrace_function() does the equivalent of a - * synchronize_sched() before the func_stack removal. + * synchronize_rcu() before the func_stack removal. */ if (WARN_ON_ONCE(!func)) goto unlock; diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c index 5bc349805e03..304d5eb8a98c 100644 --- a/kernel/livepatch/transition.c +++ b/kernel/livepatch/transition.c @@ -52,7 +52,7 @@ static DECLARE_DELAYED_WORK(klp_transition_work, klp_transition_work_fn); /* * This function is just a stub to implement a hard force - * of synchronize_sched(). This requires synchronizing + * of synchronize_rcu(). This requires synchronizing * tasks even in userspace and idle. */ static void klp_sync(struct work_struct *work) @@ -175,7 +175,7 @@ void klp_cancel_transition(void) void klp_update_patch_state(struct task_struct *task) { /* - * A variant of synchronize_sched() is used to allow patching functions + * A variant of synchronize_rcu() is used to allow patching functions * where RCU is not watching, see klp_synchronize_transition(). */ preempt_disable_notrace(); -- cgit v1.2.3