linux-kernel - [PATCH v2] PM: Add EXPORT macros for exporting PM functions

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Date:   Mon, 13 Feb 2023 16:50:05 +0000
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     <rafael@...nel.org>, <pavel@....cz>, <len.brown@...el.com>
CC:     <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <patches@...nsource.cirrus.com>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>
Subject: [PATCH v2] PM: Add EXPORT macros for exporting PM functions

Add a pair of macros for exporting functions only if CONFIG_PM
is enabled.

The naming follows the style of the standard EXPORT_SYMBOL_*()
macros that they replace.

Sometimes a module wants to export PM functions directly to other
drivers, not a complete struct dev_pm_ops. A typical example is
where a core library exports the generic (shared) implementation
and calling code wraps one or more of these in custom code.

Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
---
 include/linux/pm.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/pm.h b/include/linux/pm.h
index 93cd34f00822..035d9649eba4 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -379,9 +379,13 @@ const struct dev_pm_ops name = { \
 	const struct dev_pm_ops name;					\
 	__EXPORT_SYMBOL(name, sec, ns);					\
 	const struct dev_pm_ops name
+#define EXPORT_PM_FN_GPL(name)		EXPORT_SYMBOL_GPL(name)
+#define EXPORT_PM_FN_NS_GPL(name, ns)	EXPORT_SYMBOL_NS_GPL(name, ns)
 #else
 #define _EXPORT_DEV_PM_OPS(name, sec, ns)				\
 	static __maybe_unused const struct dev_pm_ops __static_##name
+#define EXPORT_PM_FN_GPL(name)
+#define EXPORT_PM_FN_NS_GPL(name, ns)
 #endif
 
 #define EXPORT_DEV_PM_OPS(name) _EXPORT_DEV_PM_OPS(name, "", "")
-- 
2.30.2