linux-kernel - [PATCH v3] gpiolib: fix linker errors when GPIOLIB is disabled

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Message-Id: <20230124013138.358595-1-pierluigi.p@variscite.com>
Date:   Tue, 24 Jan 2023 02:31:38 +0100
From:   Pierluigi Passaro <pierluigi.p@...iscite.com>
To:     linus.walleij@...aro.org, brgl@...ev.pl,
        yamada.masahiro@...ionext.com, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, sfr@...b.auug.org.au
Cc:     eran.m@...iscite.com, nate.d@...iscite.com,
        francesco.f@...iscite.com, pierluigi.passaro@...il.com,
        Pierluigi Passaro <pierluigi.p@...iscite.com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH v3] gpiolib: fix linker errors when GPIOLIB is disabled

Both the functions gpiochip_request_own_desc and
gpiochip_free_own_desc are exported from
    drivers/gpio/gpiolib.c
but this file is compiled only when CONFIG_GPIOLIB is enabled.
Move the prototypes under "#ifdef CONFIG_GPIOLIB" and provide
reasonable definitions and includes in the "#else" branch.

Fixes: 9091373ab7ea ("gpio: remove less important #ifdef around declarations")
Signed-off-by: Pierluigi Passaro <pierluigi.p@...iscite.com>
Reported-by: kernel test robot <lkp@...el.com>
---
Changes in v2:
- add Fixes tag
Changes in v3:
- add includes to fix builds against x86_64-defconfig

 include/linux/gpio/driver.h | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 44783fc16125..e00eaba724dc 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -758,6 +758,8 @@ gpiochip_remove_pin_ranges(struct gpio_chip *gc)
 
 #endif /* CONFIG_PINCTRL */
 
+#ifdef CONFIG_GPIOLIB
+
 struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *gc,
 					    unsigned int hwnum,
 					    const char *label,
@@ -765,8 +767,6 @@ struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *gc,
 					    enum gpiod_flags dflags);
 void gpiochip_free_own_desc(struct gpio_desc *desc);
 
-#ifdef CONFIG_GPIOLIB
-
 /* lock/unlock as IRQ */
 int gpiochip_lock_as_irq(struct gpio_chip *gc, unsigned int offset);
 void gpiochip_unlock_as_irq(struct gpio_chip *gc, unsigned int offset);
@@ -776,6 +776,25 @@ struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc);
 
 #else /* CONFIG_GPIOLIB */
 
+#include <linux/gpio/machine.h>
+#include <linux/gpio/consumer.h>
+
+static inline struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *gc,
+					    unsigned int hwnum,
+					    const char *label,
+					    enum gpio_lookup_flags lflags,
+					    enum gpiod_flags dflags)
+{
+	/* GPIO can never have been requested */
+	WARN_ON(1);
+	return ERR_PTR(-ENODEV);
+}
+
+static inline void gpiochip_free_own_desc(struct gpio_desc *desc)
+{
+	WARN_ON(1);
+}
+
 static inline struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
 {
 	/* GPIO can never have been requested */
-- 
2.34.1