linux-kernel - [PATCH v1] of: reserved-memory: Add stub for RESERVEDMEM_OF

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Message-Id: <20210610162313.20942-1-digetx@gmail.com>
Date:   Thu, 10 Jun 2021 19:23:13 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: [PATCH v1] of: reserved-memory: Add stub for RESERVEDMEM_OF_DECLARE()

The reserved-memory Kconfig could be disabled when drivers are
compile-tested. In this case RESERVEDMEM_OF_DECLARE() produces a
noisy warning about the orphaned __reservedmem_of_table section.
Add the missing stub that fixes the warning. In particular this is
needed for compile-testing of NVIDIA Tegra210 memory driver which
uses reserved-memory.

Reported-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 include/linux/of.h              | 11 +++++++----
 include/linux/of_reserved_mem.h |  8 ++++++--
 2 files changed, 13 insertions(+), 6 deletions(-)

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)
 {
-- 
2.30.2