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Subjectinclude/linux/io-mapping.h:130:39: error: implicit declaration of function 'ioremap_wc'
Hi Linus,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 0cbbc422d56668528f6efd1234fe908010284082
commit: 7d4defe21c682c934a19fce1ba8b54b7bde61b08 gpio: include <linux/io-mapping.h> in gpiolib-of
date: 9 weeks ago
config: um-allyesconfig (attached as .config)
compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
git checkout 7d4defe21c682c934a19fce1ba8b54b7bde61b08
# save the attached .config to linux build tree
make ARCH=um

All errors (new ones prefixed by >>):

In file included from drivers/gpio/gpiolib-of.c:19:0:
include/linux/io-mapping.h: In function 'io_mapping_create_wc':
>> include/linux/io-mapping.h:130:39: error: implicit declaration of function 'ioremap_wc' [-Werror=implicit-function-declaration]
return (struct io_mapping __force *) ioremap_wc(base, size);
^~~~~~~~~~
include/linux/io-mapping.h:130:9: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
return (struct io_mapping __force *) ioremap_wc(base, size);
^
include/linux/io-mapping.h: In function 'io_mapping_free':
>> include/linux/io-mapping.h:136:2: error: implicit declaration of function 'iounmap' [-Werror=implicit-function-declaration]
iounmap((void __force __iomem *) mapping);
^~~~~~~
cc1: some warnings being treated as errors

vim +/ioremap_wc +130 include/linux/io-mapping.h

4ab0d47d Venkatesh Pallipadi 2009-02-24 124 struct io_mapping;
4ab0d47d Venkatesh Pallipadi 2009-02-24 125
e5beae16 Keith Packard 2008-11-03 126 /* Create the io_mapping object*/
9663f2e6 Keith Packard 2008-10-30 127 static inline struct io_mapping *
4ab0d47d Venkatesh Pallipadi 2009-02-24 128 io_mapping_create_wc(resource_size_t base, unsigned long size)
9663f2e6 Keith Packard 2008-10-30 129 {
29bc17ec Francisco Jerez 2010-09-04 @130 return (struct io_mapping __force *) ioremap_wc(base, size);
9663f2e6 Keith Packard 2008-10-30 131 }
9663f2e6 Keith Packard 2008-10-30 132
9663f2e6 Keith Packard 2008-10-30 133 static inline void
9663f2e6 Keith Packard 2008-10-30 134 io_mapping_free(struct io_mapping *mapping)
9663f2e6 Keith Packard 2008-10-30 135 {
29bc17ec Francisco Jerez 2010-09-04 @136 iounmap((void __force __iomem *) mapping);
9663f2e6 Keith Packard 2008-10-30 137 }
9663f2e6 Keith Packard 2008-10-30 138
9663f2e6 Keith Packard 2008-10-30 139 /* Atomic map/unmap */

:::::: The code at line 130 was first introduced by commit
:::::: 29bc17ecb856ffb2b47c7009a71971c6f9334205 io-mapping: Fix the address space annotations

:::::: TO: Francisco Jerez <currojerez@riseup.net>
:::::: CC: Ingo Molnar <mingo@elte.hu>

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