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-rw-r--r--kernel/livepatch/patch.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/kernel/livepatch/patch.c b/kernel/livepatch/patch.c
index f8269036bf0b..52c4e907c14b 100644
--- a/kernel/livepatch/patch.c
+++ b/kernel/livepatch/patch.c
@@ -59,7 +59,11 @@ static void notrace klp_ftrace_handler(unsigned long ip,
ops = container_of(fops, struct klp_ops, fops);
- rcu_read_lock();
+ /*
+ * A variant of synchronize_sched() is used to allow patching functions
+ * where RCU is not watching, see klp_synchronize_transition().
+ */
+ preempt_disable_notrace();
func = list_first_or_null_rcu(&ops->func_stack, struct klp_func,
stack_node);
@@ -115,7 +119,7 @@ static void notrace klp_ftrace_handler(unsigned long ip,
klp_arch_set_pc(regs, (unsigned long)func->new_func);
unlock:
- rcu_read_unlock();
+ preempt_enable_notrace();
}
/*