systemd: Add WATCHDOG_RUNTIME_SEC optional variable

To make use of the hardware watchdog it is sufficient to set
the RuntimeWatchdogSec= option in /etc/systemd/system.conf.
It defaults to 0 (i.e. no hardware watchdog use). Set it to
a value like 20s and the watchdog is enabled.

ref: https://0pointer.de/blog/projects/watchdog.html
(From OE-Core rev: 1c61a1eb9c4faa9ab32b0440bbdd88c22c3cd945)

Signed-off-by: Benjamin Szőke <egyszeregy@freemail.hu>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/meta/recipes-core/systemd/systemd_257.1.bb b/meta/recipes-core/systemd/systemd_257.1.bb
index 9f9c83a7c3..8330157fb6 100644
--- a/meta/recipes-core/systemd/systemd_257.1.bb
+++ b/meta/recipes-core/systemd/systemd_257.1.bb
@@ -265,6 +265,11 @@ EXTRA_OEMESON += "-Dkexec-path=${sbindir}/kexec \
 # The 60 seconds is watchdog's default vaule.
 WATCHDOG_TIMEOUT ??= "60"
 
+# To make use of the hardware watchdog it is sufficient to set WATCHDOG_RUNTIME_SEC
+# (RuntimeWatchdogSec= option in /etc/systemd/system.conf) to a value like 20s
+# and the watchdog is enabled. (defaults is no hardware watchdog use)
+WATCHDOG_RUNTIME_SEC ??= ""
+
 do_install() {
         meson_do_install
 
@@ -382,6 +387,11 @@ do_install() {
                         ${D}/${sysconfdir}/systemd/system.conf
         fi
 
+        if [ -n "${WATCHDOG_RUNTIME_SEC}" ]; then
+                sed -i -e 's/#RuntimeWatchdogSec=off/RuntimeWatchdogSec=${WATCHDOG_RUNTIME_SEC}/' \
+                        ${D}/${sysconfdir}/systemd/system.conf
+        fi
+
         if ${@bb.utils.contains('PACKAGECONFIG', 'pni-names', 'true', 'false', d)}; then
                 if ! grep -q '^NamePolicy=.*mac' ${D}${nonarch_libdir}/systemd/network/99-default.link; then
                         sed -i '/^NamePolicy=/s/$/ mac/' ${D}${nonarch_libdir}/systemd/network/99-default.link