linux-kernel - Re: [PATCH 1/2] memory: tegra: Add missing dependencies

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Message-ID: <a3110fbd-c4af-0317-5a6d-1f780f1dac91@gmail.com>
Date:   Wed, 9 Jun 2021 19:57:34 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Jon Hunter <jonathanh@...dia.com>, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] memory: tegra: Add missing dependencies

09.06.2021 16:19, Krzysztof Kozlowski пишет:
> On 09/06/2021 13:58, Dmitry Osipenko wrote:
>> 09.06.2021 14:28, Thierry Reding пишет:
>>> From: Thierry Reding <treding@...dia.com>
>>>
>>> When enabling the COMPILE_TEST Kconfig option, the Tegra memory
>>> controller can be built without ARCH_TEGRA being selected. However, the
>>> driver implicitly depends on some symbols pulled in via ARCH_TEGRA,
>>> which causes the build to break.
>>>
>>> Add explicit dependencies for OF_EARLY_FLATTREE and OF_RESERVED_MEM to
>>> the Tegra MC Kconfig option to make sure they are selected even if
>>> ARCH_TEGRA is not.
>>>
>>> Reported-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
>>> Signed-off-by: Thierry Reding <treding@...dia.com>
>>> ---
>>>  drivers/memory/tegra/Kconfig | 2 ++
>>>  1 file changed, 2 insertions(+)
>>>
>>> diff --git a/drivers/memory/tegra/Kconfig b/drivers/memory/tegra/Kconfig
>>> index f9bae36c03a3..ecfb071fc4f4 100644
>>> --- a/drivers/memory/tegra/Kconfig
>>> +++ b/drivers/memory/tegra/Kconfig
>>> @@ -48,6 +48,8 @@ config TEGRA124_EMC
>>>  config TEGRA210_EMC_TABLE
>>>  	bool
>>>  	depends on ARCH_TEGRA_210_SOC || COMPILE_TEST
>>> +	select OF_EARLY_FLATTREE
>>> +	select OF_RESERVED_MEM
>>>  
>>>  config TEGRA210_EMC
>>>  	tristate "NVIDIA Tegra210 External Memory Controller driver"
>>>
>>
>> Will this work if CONFIG_OF is disabled?
> 
> Yeah, good question. That's why I propose "depends on". No issues with
> unmet or circular dependencies.

What about to add stub for RESERVEDMEM_OF_DECLARE() + CONFIG_OF_RESERVED_MEM=n?

diff --git a/include/linux/of.h b/include/linux/of.h
index d8db8d3592fd..9c2e71e202d1 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -1329,6 +1329,12 @@ static inline int of_get_available_child_count(const struct device_node *np)
 	return num;
 }
 
+#define _OF_DECLARE_STUB(table, name, compat, fn, fn_type)		\
+	static const struct of_device_id __of_table_##name		\
+		__attribute__((unused))					\
+		 = { .compatible = compat,				\
+		     .data = (fn == (fn_type)NULL) ? fn : fn }
+
 #if defined(CONFIG_OF) && !defined(MODULE)
 #define _OF_DECLARE(table, name, compat, fn, fn_type)			\
 	static const struct of_device_id __of_table_##name		\
@@ -1338,10 +1344,7 @@ static inline int of_get_available_child_count(const struct device_node *np)
 		     .data = (fn == (fn_type)NULL) ? fn : fn  }
 #else
 #define _OF_DECLARE(table, name, compat, fn, fn_type)			\
-	static const struct of_device_id __of_table_##name		\
-		__attribute__((unused))					\
-		 = { .compatible = compat,				\
-		     .data = (fn == (fn_type)NULL) ? fn : fn }
+	_OF_DECLARE_STUB(table, name, compat, fn, fn_type)
 #endif
 
 typedef int (*of_init_fn_2)(struct device_node *, struct device_node *);
diff --git a/include/linux/of_reserved_mem.h b/include/linux/of_reserved_mem.h
index 76e4a0fffba4..4de2a24cadc9 100644
--- a/include/linux/of_reserved_mem.h
+++ b/include/linux/of_reserved_mem.h
@@ -27,11 +27,11 @@ struct reserved_mem_ops {
 
 typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem);
 
+#ifdef CONFIG_OF_RESERVED_MEM
+
 #define RESERVEDMEM_OF_DECLARE(name, compat, init)			\
 	_OF_DECLARE(reservedmem, name, compat, init, reservedmem_of_init_fn)
 
-#ifdef CONFIG_OF_RESERVED_MEM
-
 int of_reserved_mem_device_init_by_idx(struct device *dev,
 				       struct device_node *np, int idx);
 int of_reserved_mem_device_init_by_name(struct device *dev,
@@ -41,6 +41,10 @@ void of_reserved_mem_device_release(struct device *dev);
 
 struct reserved_mem *of_reserved_mem_lookup(struct device_node *np);
 #else
+
+#define RESERVEDMEM_OF_DECLARE(name, compat, init)			\
+	_OF_DECLARE_STUB(reservedmem, name, compat, init, reservedmem_of_init_fn)
+
 static inline int of_reserved_mem_device_init_by_idx(struct device *dev,
 					struct device_node *np, int idx)
 {