On 10/24/18 9:53 AM, Laurence Oberman wrote:
> Both graphics and serial consoles are exposed to hard lockups
> when handling a large amount of messaging. The kernel watchdog_thresh
> parameter up to now has not been available to be set on the kernel line for
> early boot.
> This patch allows the setting of watchdog_thresh to be increased
> when needed to avoid the hard lockups in the console code.
>
> Signed-off-by: Laurence Oberman <lober...@redhat.com>
> ---
> Documentation/admin-guide/kernel-parameters.txt | 8 ++++++++
> init/main.c | 9 +++++++++
> 2 files changed, 17 insertions(+)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt
> b/Documentation/admin-guide/kernel-parameters.txt
> index 4cdcd1a..cd8d588 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -4932,6 +4932,14 @@
> or other driver-specific files in the
> Documentation/watchdog/ directory.
>
> + watchdog_thresh=
> + This parameter is now available as a kernel line
> + parameter. Use watchdog_thresh=30 as example
> + This will allow early boot changes of the current
> + default of 10s to be increased when needed to
> + avoid hard lockups.
> + Default: 10
> +
The first sentence isn't needed. and s/10s/10 seconds/
How about this?
This parameter allows early boot to change the default
value of the watchdog timeout threshold from the default
of 10 seconds to avoid hard lockups. Example:
watchdog_thresh=30
> workqueue.watchdog_thresh=
> If CONFIG_WQ_WATCHDOG is configured, workqueue can
> warn stall conditions and dump internal state to
> diff --git a/init/main.c b/init/main.c
> index 1c3f902..88cbed9 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -1038,6 +1038,15 @@ static int __init set_debug_rodata(char *str)
> __setup("rodata=", set_debug_rodata);
> #endif
>
> +static int __init
> +is_watchdog_thresh_setup(char *str)
No need to split that into 2 lines; just join them, please.
> +{
> + get_option(&str, &watchdog_thresh);
> + return 1;
> +}
> +__setup("watchdog_thresh=", is_watchdog_thresh_setup);
> +
> +
> #ifdef CONFIG_STRICT_KERNEL_RWX
> static void mark_readonly(void)
> {
>
--
~Randy
