diff options
Diffstat (limited to 'kernel/livepatch/transition.c')
| -rw-r--r-- | kernel/livepatch/transition.c | 16 |
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) { |