drivers/gpio/gpiolib.c:3215: undefined reference to `of_get_named_gpiod_flags'

[kbuild test robot <fengguang.wu@intel.com>]

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Hi Linus,

It's probably a bug fix that unveils the link errors.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   f51fdffad5b7709d0ade40736b58a2da2707fa15
commit: 2527ecc9195e9c66252af24c4689e8a67cd4ccb9 gpio: Fix OF build problem on UM
date:   6 weeks ago
config: um-allmodconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 2527ecc9195e9c66252af24c4689e8a67cd4ccb9
        # save the attached .config to linux build tree
        make ARCH=um 

All errors (new ones prefixed by >>):

   arch/um/drivers/built-in.o: In function `vde_open_real':
   (.text+0xc7d1): warning: Using 'getgrnam' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   arch/um/drivers/built-in.o: In function `vde_open_real':
   (.text+0xc61c): warning: Using 'getpwuid' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   arch/um/drivers/built-in.o: In function `vde_open_real':
   (.text+0xc935): warning: Using 'getaddrinfo' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   arch/um/drivers/built-in.o: In function `pcap_nametoaddr':
   (.text+0x1d3c5): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   arch/um/drivers/built-in.o: In function `pcap_nametonetaddr':
   (.text+0x1d465): warning: Using 'getnetbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   arch/um/drivers/built-in.o: In function `pcap_nametoproto':
   (.text+0x1d685): warning: Using 'getprotobyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   arch/um/drivers/built-in.o: In function `pcap_nametoport':
   (.text+0x1d4b7): warning: Using 'getservbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   drivers/built-in.o: In function `fwnode_get_named_gpiod':
>> drivers/gpio/gpiolib.c:3215: undefined reference to `of_get_named_gpiod_flags'
   drivers/built-in.o: In function `gpiod_get_index':
   drivers/gpio/gpiolib.c:3140: undefined reference to `of_get_named_gpiod_flags'
   drivers/built-in.o: In function `zx_gpio_probe':
>> drivers/gpio/gpio-zx.c:229: undefined reference to `devm_ioremap_resource'
   `.text.exit' referenced in section `.fini_array' of /usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/libc.a(sdlerror.o): defined in discarded section `.text.exit' of /usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/libc.a(sdlerror.o)
>> collect2: error: ld returned 1 exit status

vim +3215 drivers/gpio/gpiolib.c

40b731831 Mika Westerberg    2014-10-21  3199   * In case of error an ERR_PTR() is returned.
40b731831 Mika Westerberg    2014-10-21  3200   */
40b731831 Mika Westerberg    2014-10-21  3201  struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
40b731831 Mika Westerberg    2014-10-21  3202  					 const char *propname)
40b731831 Mika Westerberg    2014-10-21  3203  {
40b731831 Mika Westerberg    2014-10-21  3204  	struct gpio_desc *desc = ERR_PTR(-ENODEV);
40b731831 Mika Westerberg    2014-10-21  3205  	bool active_low = false;
90b665f62 Laurent Pinchart   2015-10-13  3206  	bool single_ended = false;
40b731831 Mika Westerberg    2014-10-21  3207  	int ret;
40b731831 Mika Westerberg    2014-10-21  3208  
40b731831 Mika Westerberg    2014-10-21  3209  	if (!fwnode)
40b731831 Mika Westerberg    2014-10-21  3210  		return ERR_PTR(-EINVAL);
40b731831 Mika Westerberg    2014-10-21  3211  
40b731831 Mika Westerberg    2014-10-21  3212  	if (is_of_node(fwnode)) {
40b731831 Mika Westerberg    2014-10-21  3213  		enum of_gpio_flags flags;
40b731831 Mika Westerberg    2014-10-21  3214  
c181fb3e7 Alexander Sverdlin 2015-06-22 @3215  		desc = of_get_named_gpiod_flags(to_of_node(fwnode), propname, 0,
40b731831 Mika Westerberg    2014-10-21  3216  						&flags);
90b665f62 Laurent Pinchart   2015-10-13  3217  		if (!IS_ERR(desc)) {
40b731831 Mika Westerberg    2014-10-21  3218  			active_low = flags & OF_GPIO_ACTIVE_LOW;
90b665f62 Laurent Pinchart   2015-10-13  3219  			single_ended = flags & OF_GPIO_SINGLE_ENDED;
90b665f62 Laurent Pinchart   2015-10-13  3220  		}
40b731831 Mika Westerberg    2014-10-21  3221  	} else if (is_acpi_node(fwnode)) {
40b731831 Mika Westerberg    2014-10-21  3222  		struct acpi_gpio_info info;
40b731831 Mika Westerberg    2014-10-21  3223  

:::::: The code at line 3215 was first introduced by commit
:::::: c181fb3e723351e2f7a1f76b6c0627a4b8ad1723 ACPI / OF: Rename of_node() and acpi_node() to to_of_node() and to_acpi_node()

:::::: TO: Alexander Sverdlin <alexander.sverdlin@gmail.com>
:::::: CC: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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