[PATCH v8 05/27] kernel/reboot: Add do_kernel_power_off()

Dmitry Osipenko
2022-05-09T23:34:09Z

Add do_kernel_power_off() helper that will remove open-coded pm_power_off
invocations from the architecture code. This is the first step on the way
to remove the global pm_power_off variable, which will allow us to
implement consistent power-off chaining support.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
include/linux/reboot.h | 2 ++
kernel/reboot.c | 13 +++++++++++++
2 files changed, 15 insertions(+)

diff --git a/include/linux/reboot.h b/include/linux/reboot.h
index 05981ef079d8..6b951d68c0c7 100644
--- a/include/linux/reboot.h
+++ b/include/linux/reboot.h
@@ -63,6 +63,8 @@ extern void machine_shutdown(void);
struct pt_regs;
extern void machine_crash_shutdown(struct pt_regs *);

+void do_kernel_power_off(void);
+
/*
* sys-off handler API.
*/
diff --git a/kernel/reboot.c b/kernel/reboot.c
index 2fb0357d9483..9afa99a32d62 100644
--- a/kernel/reboot.c
+++ b/kernel/reboot.c
@@ -504,6 +504,19 @@ static void do_kernel_power_off_prepare(void)
blocking_notifier_call_chain(&power_off_prep_handler_list, 0, NULL);
}

+/**
+ * do_kernel_power_off - Execute kernel power-off handler call chain
+ *
+ * Expected to be called as last step of the power-off sequence.
+ *
+ * Powers off the system immediately if a power-off handler function has
+ * been registered. Otherwise does nothing.
+ */
+void do_kernel_power_off(void)
+{
+ atomic_notifier_call_chain(&power_off_handler_list, 0, NULL);
+}
+
/**
* kernel_power_off - power_off the system
*
--
2.35.1