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sched,livepatch: Use wake_up_if_idle()

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Make sure to prod idle CPUs so they call klp_update_patch_state().

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Vasily Gorbik <gor@linux.ibm.com>
Tested-by: Petr Mladek <pmladek@suse.com>
Tested-by: Vasily Gorbik <gor@linux.ibm.com> # on s390
Link: https://lkml.kernel.org/r/20210929151723.162004989@infradead.org
This commit is contained in:
Peter Zijlstra 2021-09-21 22:16:02 +02:00
parent 8850cb663b
commit 5de62ea84a
2 changed files with 8 additions and 1 deletions
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4
include/linux/sched/idle.h
View File

@ -11,7 +11,11 @@ enum cpu_idle_type {
CPU_MAX_IDLE_TYPES
};
#ifdef CONFIG_SMP
extern void wake_up_if_idle(int cpu);
#else
static inline void wake_up_if_idle(int cpu) { }
#endif
/*
* Idle thread specific functions to determine the need_resched

5
kernel/livepatch/transition.c
View File

@ -413,8 +413,11 @@ void klp_try_complete_transition(void)
for_each_possible_cpu(cpu) {
task = idle_task(cpu);
if (cpu_online(cpu)) {
if (!klp_try_switch_task(task))
if (!klp_try_switch_task(task)) {
complete = false;
/* Make idle task go through the main loop. */
wake_up_if_idle(cpu);
}
} else if (task->patch_state != klp_target_state) {
/* offline idle tasks can be switched immediately */
clear_tsk_thread_flag(task, TIF_PATCH_PENDING);