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watchdog: Use depends instead of select for pretimeout governors 

Watchdog pretimeout governors were enabled from the default governor
selection using "select". As a result, the default governor was always
built into the kernel, even if no watchdog driver was loaded. By using
"depends on" instead of "select", we are in better control, and the
governors can all be built as modules. At the same time, set the default
configuration option for pretimeout governors to match WATCHDOG_CORE
(meaning all pretimeout governors are by default enabled if pretimeout
support is enabled).

The practical impact of this change is minimal. Previously, selecting
a default governor automatically enabled that governor. Now, a default
governor can only be selected if that governor has been enabled.
Consequently, the order of governor selection is now reversed: The
governor selection is now first, followed by default governor selection.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Guenter Roeck 2019-04-29 12:28:27 -07:00 committed by Wim Van Sebroeck
parent 0b468829c3
commit f627ac0e12
1 changed files with 16 additions and 14 deletions
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30
drivers/watchdog/Kconfig
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@ -2062,6 +2062,20 @@ config WATCHDOG_PRETIMEOUT_GOV
if WATCHDOG_PRETIMEOUT_GOV
config WATCHDOG_PRETIMEOUT_GOV_NOOP
tristate "Noop watchdog pretimeout governor"
default WATCHDOG_CORE
help
Noop watchdog pretimeout governor, only an informational
message is added to kernel log buffer.
config WATCHDOG_PRETIMEOUT_GOV_PANIC
tristate "Panic watchdog pretimeout governor"
default WATCHDOG_CORE
help
Panic watchdog pretimeout governor, on watchdog pretimeout
event put the kernel into panic.
choice
prompt "Default Watchdog Pretimeout Governor"
default WATCHDOG_PRETIMEOUT_DEFAULT_GOV_PANIC
@ -2072,7 +2086,7 @@ choice
config WATCHDOG_PRETIMEOUT_DEFAULT_GOV_NOOP
bool "noop"
select WATCHDOG_PRETIMEOUT_GOV_NOOP
depends on 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
@ -2080,7 +2094,7 @@ config WATCHDOG_PRETIMEOUT_DEFAULT_GOV_NOOP
config WATCHDOG_PRETIMEOUT_DEFAULT_GOV_PANIC
bool "panic"
select WATCHDOG_PRETIMEOUT_GOV_PANIC
depends on WATCHDOG_PRETIMEOUT_GOV_PANIC
help
Use panic watchdog pretimeout governor by default, if
a watchdog pretimeout event happens, consider that
@ -2088,18 +2102,6 @@ config WATCHDOG_PRETIMEOUT_DEFAULT_GOV_PANIC
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.
config WATCHDOG_PRETIMEOUT_GOV_PANIC
tristate "Panic watchdog pretimeout governor"
help
Panic watchdog pretimeout governor, on watchdog pretimeout
event put the kernel into panic.
endif # WATCHDOG_PRETIMEOUT_GOV
endif # WATCHDOG