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 <[email protected]> --- init/main.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/init/main.c b/init/main.c index e4a3160..5882750 100644 --- a/init/main.c +++ b/init/main.c @@ -977,6 +977,15 @@ static int __init set_debug_rodata(char *str) __setup("rodata=", set_debug_rodata); #endif +static int __init +is_watchdog_thresh_setup(char *str) +{ + get_option(&str, &watchdog_thresh); + return 1; +} +__setup("watchdog_thresh=", is_watchdog_thresh_setup); + + #ifdef CONFIG_STRICT_KERNEL_RWX static void mark_readonly(void) { -- 1.8.3.1 --- Documentation/admin-guide/kernel-parameters.txt | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index bf03fe4..a5280a1 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4615,6 +4615,14 @@ 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 + workqueue.watchdog_thresh= If CONFIG_WQ_WATCHDOG is configured, workqueue can warn stall conditions and dump internal state to -- 1.8.3.1
