Subject: Re: [PATCH] asm-generic: Fix build when __set_fixmap is absent

From: kbuild test robot <[email-masked]>
Date: Wed, 10 Feb 2016 00:13:31 +0800

Hi Mark,

[auto build test ERROR on next-20160209]
[also build test ERROR on v4.5-rc3]
[cannot apply to v4.5-rc3 v4.5-rc2 v4.5-rc1]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Mark-Rutland/asm-generic-Fix-build-when-__set_fixmap-is-absent/20160209-223916
config: um-alldefconfig (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=um 

All errors (new ones prefixed by >>):

   In file included from arch/um/include/asm/fixmap.h:54:0,
                    from arch/um/include/asm/pgtable.h:11,
                    from include/linux/mm.h:67,
                    from include/linux/ring_buffer.h:5,
                    from include/linux/trace_events.h:5,
                    from include/trace/syscall.h:6,
                    from include/linux/syscalls.h:81,
                    from init/main.c:18:
>> include/asm-generic/fixmap.h:72:6: error: conflicting types for '__set_fixmap'
    void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
         ^
   In file included from arch/um/include/asm/pgtable.h:11:0,
                    from include/linux/mm.h:67,
                    from include/linux/ring_buffer.h:5,
                    from include/linux/trace_events.h:5,
                    from include/trace/syscall.h:6,
                    from include/linux/syscalls.h:81,
                    from init/main.c:18:
   arch/um/include/asm/fixmap.h:39:13: note: previous declaration of '__set_fixmap' was here
    extern void __set_fixmap (enum fixed_addresses idx,
                ^

vim +/__set_fixmap +72 include/asm-generic/fixmap.h

    66	
    67	#ifndef clear_fixmap
    68	#define clear_fixmap(idx)			\
    69		__set_fixmap(idx, 0, FIXMAP_PAGE_CLEAR)
    70	#endif
    71	
  > 72	void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
    73	
    74	/* Return a pointer with offset calculated */
    75	static inline unsigned long __set_fixmap_offset(enum fixed_addresses idx,

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