On Tue, 12 Nov 2019 11:17:47 +0900
Sergey Senozhatsky <sergey.senozhatsky.work@xxxxxxxxx> wrote:
> void show_stack(struct task_struct *task, unsigned long *sp, int log_level)
> {
> printk_emergency_enter(log_level);
> __show_stack(task, sp);
> printk_emergency_exit();
> }
> // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - //
>
> show_stack() never schedules, disabling preemption around it should
> not change anything. Should it be interrupted, we will handle it via
> preempt count.
Please no! The whole point of the printk rewrite was to allow for
printk to be preemptible and used in more contexts. The show_stack() can
be all over the place and is not a fast function. Let's not disable
preemption for it.
-- Steve
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