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-rw-r--r--kernel/livepatch/transition.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c
index 300273819674..ea7697bb753e 100644
--- a/kernel/livepatch/transition.c
+++ b/kernel/livepatch/transition.c
@@ -29,10 +29,14 @@
#define MAX_STACK_ENTRIES 100
#define STACK_ERR_BUF_SIZE 128
+#define SIGNALS_TIMEOUT 15
+
struct klp_patch *klp_transition_patch;
static int klp_target_state = KLP_UNDEFINED;
+static unsigned int klp_signals_cnt;
+
/*
* This work can be performed periodically to finish patching or unpatching any
* "straggler" tasks which failed to transition in the first attempt.
@@ -393,6 +397,10 @@ void klp_try_complete_transition(void)
put_online_cpus();
if (!complete) {
+ if (klp_signals_cnt && !(klp_signals_cnt % SIGNALS_TIMEOUT))
+ klp_send_signals();
+ klp_signals_cnt++;
+
/*
* Some tasks weren't able to be switched over. Try again
* later and/or wait for other methods like kernel exit
@@ -454,6 +462,8 @@ void klp_start_transition(void)
if (task->patch_state != klp_target_state)
set_tsk_thread_flag(task, TIF_PATCH_PENDING);
}
+
+ klp_signals_cnt = 0;
}
/*
@@ -578,14 +588,14 @@ void klp_copy_process(struct task_struct *child)
/*
* Sends a fake signal to all non-kthread tasks with TIF_PATCH_PENDING set.
- * Kthreads with TIF_PATCH_PENDING set are woken up. Only admin can request this
- * action currently.
+ * Kthreads with TIF_PATCH_PENDING set are woken up.
*/
void klp_send_signals(void)
{
struct task_struct *g, *task;
- pr_notice("signaling remaining tasks\n");
+ if (klp_signals_cnt == SIGNALS_TIMEOUT)
+ pr_notice("signaling remaining tasks\n");
read_lock(&tasklist_lock);
for_each_process_thread(g, task) {