Re: [PATCH v4 16/17] selftests/verification: Rearrange the wwnr_printk test

[Gabriele Monaco <gmonaco@redhat.com>]

On Fri, 2026-07-17 at 17:46 +0200, Gabriele Monaco wrote:
> +# loads may flood the ringbuffer, wait for all pending printks
> +wait_dmesg_flush() {
> +	local last_before last_after=$(dmesg | grep "rv:" | tail -n 1 ||
> true)
> +	while [ "$last_before" != "$last_after" ]; do
> +		last_before=$last_after
> +		sleep .3
> +		last_after=$(dmesg | grep "rv:" | tail -n 1 || true)
> +	done
>  }
>  
>  echo 1 > monitors/wwnr/enable
>  echo printk > monitors/wwnr/reactors
>  
>  load
> +wait_dmesg_flush

On some systems this may trigger wwnr's reactions and run indefinitely, I'm
going to send a V5 moving this after turning monitoring/reacting of and adding a
timeout, just in case those switches don't work.

>  
>  echo 0 > monitoring_on
>  ! load || false
>  echo 1 > monitoring_on
>  
>  load
> +wait_dmesg_flush
>  
>  echo 0 > reacting_on
>  ! load || false