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From: Masahiro Yamada <masahiroy@kernel.org>
To: linux-kbuild@vger.kernel.org
Cc: linux-gpio@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
	Paul Cercueil <paul@crapouillou.net>,
	Masahiro Yamada <masahiroy@kernel.org>,
	Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org
Subject: [PATCH 2/2] pm: allow drivers to drop #ifdef and __maybe_unused from pm callbacks
Date: Fri,  9 Apr 2021 05:58:58 +0900	[thread overview]
Message-ID: <20210408205858.51751-3-masahiroy@kernel.org> (raw)
In-Reply-To: <20210408205858.51751-1-masahiroy@kernel.org>

Drivers typically surround suspend and resume callbacks with #ifdef
CONFIG_PM(_SLEEP) or mark them as __maybe_unused in order to avoid
-Wunused-const-variable warnings.

With this commit, drivers will be able to remove #ifdef CONFIG_PM(_SLEEP)
and __maybe_unsed because unused functions are dropped by the compiler
instead of the preprocessor.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

 include/linux/pm.h | 67 +++++++++++++++++-----------------------------
 1 file changed, 24 insertions(+), 43 deletions(-)

diff --git a/include/linux/pm.h b/include/linux/pm.h
index 482313a8ccfc..ca764566692a 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -301,50 +301,37 @@ struct dev_pm_ops {
 	int (*runtime_idle)(struct device *dev);
 };
 
-#ifdef CONFIG_PM_SLEEP
+#define pm_ptr(_ptr)		PTR_IF(IS_ENABLED(CONFIG_PM), _ptr)
+#define pm_sleep_ptr(_ptr)	PTR_IF(IS_ENABLED(CONFIG_PM_SLEEP), _ptr)
+
 #define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
-	.suspend = suspend_fn, \
-	.resume = resume_fn, \
-	.freeze = suspend_fn, \
-	.thaw = resume_fn, \
-	.poweroff = suspend_fn, \
-	.restore = resume_fn,
-#else
-#define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
-#endif
+	.suspend  = pm_sleep_ptr(suspend_fn), \
+	.resume   = pm_sleep_ptr(resume_fn), \
+	.freeze   = pm_sleep_ptr(suspend_fn), \
+	.thaw     = pm_sleep_ptr(resume_fn), \
+	.poweroff = pm_sleep_ptr(suspend_fn), \
+	.restore  = pm_sleep_ptr(resume_fn),
 
-#ifdef CONFIG_PM_SLEEP
 #define SET_LATE_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
-	.suspend_late = suspend_fn, \
-	.resume_early = resume_fn, \
-	.freeze_late = suspend_fn, \
-	.thaw_early = resume_fn, \
-	.poweroff_late = suspend_fn, \
-	.restore_early = resume_fn,
-#else
-#define SET_LATE_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
-#endif
+	.suspend_late  = pm_sleep_ptr(suspend_fn), \
+	.resume_early  = pm_sleep_ptr(resume_fn), \
+	.freeze_late   = pm_sleep_ptr(suspend_fn), \
+	.thaw_early    = pm_sleep_ptr(resume_fn), \
+	.poweroff_late = pm_sleep_ptr(suspend_fn), \
+	.restore_early = pm_sleep_ptr(resume_fn),
 
-#ifdef CONFIG_PM_SLEEP
 #define SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
-	.suspend_noirq = suspend_fn, \
-	.resume_noirq = resume_fn, \
-	.freeze_noirq = suspend_fn, \
-	.thaw_noirq = resume_fn, \
-	.poweroff_noirq = suspend_fn, \
-	.restore_noirq = resume_fn,
-#else
-#define SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
-#endif
+	.suspend_noirq  = pm_sleep_ptr(suspend_fn), \
+	.resume_noirq   = pm_sleep_ptr(resume_fn), \
+	.freeze_noirq   = pm_sleep_ptr(suspend_fn), \
+	.thaw_noirq     = pm_sleep_ptr(resume_fn), \
+	.poweroff_noirq = pm_sleep_ptr(suspend_fn), \
+	.restore_noirq  = pm_sleep_ptr(resume_fn),
 
-#ifdef CONFIG_PM
 #define SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
-	.runtime_suspend = suspend_fn, \
-	.runtime_resume = resume_fn, \
-	.runtime_idle = idle_fn,
-#else
-#define SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn)
-#endif
+	.runtime_suspend = pm_ptr(suspend_fn), \
+	.runtime_resume  = pm_ptr(resume_fn), \
+	.runtime_idle    = pm_ptr(idle_fn),
 
 /*
  * Use this if you want to use the same suspend and resume callbacks for suspend
@@ -374,12 +361,6 @@ const struct dev_pm_ops __maybe_unused name = { \
 	SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
 }
 
-#ifdef CONFIG_PM
-#define pm_ptr(_ptr) (_ptr)
-#else
-#define pm_ptr(_ptr) NULL
-#endif
-
 /*
  * PM_EVENT_ messages
  *
-- 
2.27.0


  parent reply	other threads:[~2021-04-08 20:59 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-08 20:58 [PATCH 0/2] linux/kconfig.h: move IF_ENABLED() out of <linux/kconfig.h> Masahiro Yamada
2021-04-08 20:58 ` [PATCH 1/2] linux/kconfig.h: replace IF_ENABLED() with PTR_IF() in <linux/kernel.h> Masahiro Yamada
2021-04-09  8:15   ` Paul Cercueil
2021-04-09  8:30     ` Masahiro Yamada
2021-04-09  9:38       ` Paul Cercueil
2021-04-09  9:24   ` Andy Shevchenko
2021-04-10  3:52     ` Masahiro Yamada
2021-04-08 20:58 ` Masahiro Yamada [this message]
2021-04-08 21:29   ` [PATCH 2/2] pm: allow drivers to drop #ifdef and __maybe_unused from pm callbacks Arnd Bergmann
2021-04-09  3:17     ` Masahiro Yamada
2021-04-08 23:49   ` kernel test robot
2021-04-08 23:55   ` kernel test robot

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