watchdog: pretimeout: add noop pretimeout governor

The change adds noop watchdog pretimeout governor, only an
informational message is printed to the kernel log buffer when a
watchdog triggers a pretimeout event.

While introducing the first pretimeout governor the selected design
assumes that the default pretimeout governor is selected by its name
and it is always built-in, thus the default pretimeout governor can
not be unregistered and the correspondent check can be removed from
the watchdog_unregister_governor() function.

Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 04d535ae497d..4aeb8f95beb4 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1838,4 +1838,32 @@ config WATCHDOG_PRETIMEOUT_GOV
         help
           The option allows to select watchdog pretimeout governors.
 
+if WATCHDOG_PRETIMEOUT_GOV
+
+choice
+        prompt "Default Watchdog Pretimeout Governor"
+        default WATCHDOG_PRETIMEOUT_DEFAULT_GOV_PANIC
+        help
+          This option selects a default watchdog pretimeout governor.
+          The governor takes its action, if a watchdog is capable
+          to report a pretimeout event.
+
+config WATCHDOG_PRETIMEOUT_DEFAULT_GOV_NOOP
+        bool "noop"
+        select WATCHDOG_PRETIMEOUT_GOV_NOOP
+        help
+          Use noop watchdog pretimeout governor by default. If noop
+          governor is selected by a user, write a short message to
+          the kernel log buffer and don't do any system changes.
+
+endchoice
+
+config WATCHDOG_PRETIMEOUT_GOV_NOOP
+        tristate "Noop watchdog pretimeout governor"
+        help
+          Noop watchdog pretimeout governor, only an informational
+          message is added to kernel log buffer.
+
+endif # WATCHDOG_PRETIMEOUT_GOV
+
 endif # WATCHDOG