watchdog: Enforce that at least one pretimeout governor is enabled

Since commit "watchdog: Use depends instead of select for pretimeout
governors", it was possible to enable pretimeout governors but keep all
of them disabled. Doing this results in the following build failure.

../drivers/watchdog/watchdog_pretimeout.c:
	In function ‘watchdog_register_governor’:
../drivers/watchdog/watchdog_pretimeout.c:139:26: error:
	‘WATCHDOG_PRETIMEOUT_DEFAULT_GOV’ undeclared
   if (!strncmp(gov->name, WATCHDOG_PRETIMEOUT_DEFAULT_GOV,

Since it does not make sense to enable pretimeout support but disable
all pretimeout governors, enforce that at least one of them is always
enabled.

Fixes: f627ac0e12cd ("watchdog: Use depends instead of select for pretimeout governors")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index f457992..7ea6037 100644 (file)
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -71,6 +71,12 @@ config WATCHDOG_PRETIMEOUT_GOV
        help
          The option allows to select watchdog pretimeout governors.
 
+config WATCHDOG_PRETIMEOUT_GOV_SEL
+       tristate
+       depends on WATCHDOG_PRETIMEOUT_GOV
+       default m
+       select WATCHDOG_PRETIMEOUT_GOV_PANIC if WATCHDOG_PRETIMEOUT_GOV_NOOP=n
+
 if WATCHDOG_PRETIMEOUT_GOV
 
 config WATCHDOG_PRETIMEOUT_GOV_NOOP