Re: [PATCH] dump_stack: Avoid the livelock of the dump_lock

[Linus Torvalds]

On Tue, Oct 29, 2019 at 3:09 PM Kevin Hao <haokexin@xxxxxxxxx> wrote:
>
> Do you mean something like this?

Yeah, except I'd make it be something like

                local_irq_restore(flags);
-               cpu_relax();
+               do { cpu_relax(); } while (atomic_read(&dump_lock) != -1);
                goto retry;

instead, ie doing the cpu_relax() inside that loop.

Obviously untested.

          Linus