[PATCH v2 1/1] powerpc/crash: Use NMI context for printk when starting to crash

[Michael Ellerman]

On Tue, 12 May 2020 18:45:35 -0300, Leonardo Bras wrote:
> Currently, if printk lock (logbuf_lock) is held by other thread during
> crash, there is a chance of deadlocking the crash on next printk, and
> blocking a possibly desired kdump.
> 
> At the start of default_machine_crash_shutdown, make printk enter
> NMI context, as it will use per-cpu buffers to store the message,
> and avoid locking logbuf_lock.

Applied to powerpc/next.

[1/1] powerpc/crash: Use NMI context for printk when starting to crash
      https://git.kernel.org/powerpc/c/af2876b501e42c3fb5174cac9dd02598436f0fdf

cheers