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Subject: [PATCH v8 05/27] kernel/reboot: Add do_kernel_power_off()
Date:   Tue, 10 May 2022 02:32:13 +0300
Message-Id: <20220509233235.995021-6-dmitry.osipenko@collabora.com>
In-Reply-To: <20220509233235.995021-1-dmitry.osipenko@collabora.com>
References: <20220509233235.995021-1-dmitry.osipenko@collabora.com>
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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