linux-kernel - [PATCH] thermal: devfreq_cooling: inline all stubs for CONFIG_DEVFREQ

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Message-Id: <20200403205133.1101808-1-martin.blumenstingl@googlemail.com>
Date:   Fri,  3 Apr 2020 22:51:33 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     rui.zhang@...el.com, daniel.lezcano@...aro.org,
        amit.kucheria@...durent.com, linux-pm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, javi.merino@...nel.org,
        edubezval@...il.com, orjan.eide@....com, tzimmermann@...e.de,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        stable@...r.kernel.org
Subject: [PATCH] thermal: devfreq_cooling: inline all stubs for CONFIG_DEVFREQ_THERMAL=n

When CONFIG_DEVFREQ_THERMAL is disabled all functions except
of_devfreq_cooling_register_power() were already inlined. Also inline
the last function to avoid compile errors when multiple drivers call
of_devfreq_cooling_register_power() when CONFIG_DEVFREQ_THERMAL is not
set. Compilation failed with the following message:
  multiple definition of `of_devfreq_cooling_register_power'
(which then lists all usages of of_devfreq_cooling_register_power())

Thomas Zimmermann reported this problem [0] on a kernel config with
CONFIG_DRM_LIMA={m,y}, CONFIG_DRM_PANFROST={m,y} and
CONFIG_DEVFREQ_THERMAL=n after both, the lima and panfrost drivers
gained devfreq cooling support.

[0] https://www.spinics.net/lists/dri-devel/msg252825.html

Fixes: a76caf55e5b356 ("thermal: Add devfreq cooling")
Cc: stable@...r.kernel.org
Reported-by: Thomas Zimmermann <tzimmermann@...e.de>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
---
 include/linux/devfreq_cooling.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/devfreq_cooling.h b/include/linux/devfreq_cooling.h
index 4635f95000a4..79a6e37a1d6f 100644
--- a/include/linux/devfreq_cooling.h
+++ b/include/linux/devfreq_cooling.h
@@ -75,7 +75,7 @@ void devfreq_cooling_unregister(struct thermal_cooling_device *dfc);

 #else /* !CONFIG_DEVFREQ_THERMAL */

-struct thermal_cooling_device *
+static inline struct thermal_cooling_device *
 of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
 				  struct devfreq_cooling_power *dfc_power)
 {
-- 
2.26.0