[PATCH 00/50] Add log level to show_stack()

[Steven Rostedt]

On Tue, 12 Nov 2019 11:17:47 +0900
Sergey Senozhatsky <sergey.senozhatsky.work at gmail.com> 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