linux-kernel - [PATCH] PM / devfreq: Fix build issues with devfreq disabled

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Message-Id: <20230123153745.3185032-1-robdclark@gmail.com>
Date:   Mon, 23 Jan 2023 07:37:45 -0800
From:   Rob Clark <robdclark@...il.com>
To:     linux-pm@...r.kernel.org
Cc:     dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Rob Clark <robdclark@...omium.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Chia-I Wu <olvaffe@...il.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] PM / devfreq: Fix build issues with devfreq disabled

From: Rob Clark <robdclark@...omium.org>

The existing no-op shims for when PM_DEVFREQ (or an individual governor)
only do half the job.  The governor specific config/tuning structs need
to be available to avoid compile errors in drivers using devfreq.

Fixes: 6563f60f14cb ("drm/msm/gpu: Add devfreq tuning debugfs")
Signed-off-by: Rob Clark <robdclark@...omium.org>
---
Assuming this doesn't conflict with anything else landing via another
tree, an a-b to land this via drm/msm-next would let us un-break builds.
(And also start removing "select DEVFREQ_GOV_SIMPLE_ONDEMAND"s added in
various places to try to work around this issue.)

 include/linux/devfreq.h | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index 4dc7cda4fd46..7fd704bb8f3d 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -273,8 +273,8 @@ void devm_devfreq_unregister_notifier(struct device *dev,
 struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node);
 struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,
 				const char *phandle_name, int index);
+#endif /* CONFIG_PM_DEVFREQ */
 
-#if IS_ENABLED(CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND)
 /**
  * struct devfreq_simple_ondemand_data - ``void *data`` fed to struct devfreq
  *	and devfreq_add_device
@@ -292,9 +292,7 @@ struct devfreq_simple_ondemand_data {
 	unsigned int upthreshold;
 	unsigned int downdifferential;
 };
-#endif
 
-#if IS_ENABLED(CONFIG_DEVFREQ_GOV_PASSIVE)
 enum devfreq_parent_dev_type {
 	DEVFREQ_PARENT_DEV,
 	CPUFREQ_PARENT_DEV,
@@ -337,9 +335,8 @@ struct devfreq_passive_data {
 	struct notifier_block nb;
 	struct list_head cpu_data_list;
 };
-#endif
 
-#else /* !CONFIG_PM_DEVFREQ */
+#if !defined(CONFIG_PM_DEVFREQ)
 static inline struct devfreq *devfreq_add_device(struct device *dev,
 					struct devfreq_dev_profile *profile,
 					const char *governor_name,
-- 
2.38.1