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Date:   Wed, 20 Dec 2017 18:10:50 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Greentime Hu <green.hu@...il.com>
Cc:     kbuild-all@...org, greentime@...estech.com,
        linux-kernel@...r.kernel.org, arnd@...db.de,
        linux-arch@...r.kernel.org, tglx@...utronix.de,
        jason@...edaemon.net, marc.zyngier@....com, robh+dt@...nel.org,
        netdev@...r.kernel.org, deanbo422@...il.com,
        devicetree@...r.kernel.org, viro@...iv.linux.org.uk,
        dhowells@...hat.com, will.deacon@....com,
        daniel.lezcano@...aro.org, linux-serial@...r.kernel.org,
        geert.uytterhoeven@...il.com, linus.walleij@...aro.org,
        mark.rutland@....com, greg@...ah.com, ren_guo@...ky.com,
        pombredanne@...b.com, green.hu@...il.com,
        Vincent Chen <vincentc@...estech.com>
Subject: Re: [PATCH v4 01/36] asm-generic/io.h: move
 ioremap_nocache/ioremap_uc/ioremap_wc/ioremap_wt out of ifndef CONFIG_MMU

Hi Greentime,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/timers/core]
[also build test ERROR on v4.15-rc4 next-20171220]
[cannot apply to linus/master]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Greentime-Hu/Andes-nds32-Linux-Kernel/20171220-155937
config: openrisc-or1ksim_defconfig (attached as .config)
compiler: or1k-linux-gcc (GCC) 6.0.0 20160327 (experimental)
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=openrisc 

All error/warnings (new ones prefixed by >>):

   In file included from include/linux/io.h:25:0,
                    from arch/openrisc/kernel/asm-offsets.c:35:
>> arch/openrisc/include/asm/io.h:38:29: error: conflicting types for 'ioremap'
    static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size)
                                ^~~~~~~
   In file included from arch/openrisc/include/asm/io.h:32:0,
                    from include/linux/io.h:25,
                    from arch/openrisc/kernel/asm-offsets.c:35:
   include/asm-generic/io.h:864:15: note: previous declaration of 'ioremap' was here
    void __iomem *ioremap(phys_addr_t phys_addr, size_t size);
                  ^~~~~~~
   include/asm-generic/io.h:865:25: error: conflicting types for 'ioremap_nocache'
    #define ioremap_nocache ioremap_nocache
                            ^
>> arch/openrisc/include/asm/io.h:44:29: note: in expansion of macro 'ioremap_nocache'
    static inline void __iomem *ioremap_nocache(phys_addr_t offset,
                                ^~~~~~~~~~~~~~~
   include/asm-generic/io.h:865:25: note: previous definition of 'ioremap_nocache' was here
    #define ioremap_nocache ioremap_nocache
                            ^
   include/asm-generic/io.h:866:29: note: in expansion of macro 'ioremap_nocache'
    static inline void __iomem *ioremap_nocache(phys_addr_t offset, size_t size)
                                ^~~~~~~~~~~~~~~
   make[2]: *** [arch/openrisc/kernel/asm-offsets.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [sub-make] Error 2

vim +/ioremap +38 arch/openrisc/include/asm/io.h

58e0166a Jonas Bonn  2011-06-04  31  
58e0166a Jonas Bonn  2011-06-04 @32  #include <asm-generic/io.h>
9b04ebd1 James Hogan 2012-10-23  33  #include <asm/pgtable.h>
58e0166a Jonas Bonn  2011-06-04  34  
58e0166a Jonas Bonn  2011-06-04  35  extern void __iomem *__ioremap(phys_addr_t offset, unsigned long size,
58e0166a Jonas Bonn  2011-06-04  36  				pgprot_t prot);
58e0166a Jonas Bonn  2011-06-04  37  
58e0166a Jonas Bonn  2011-06-04 @38  static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size)
58e0166a Jonas Bonn  2011-06-04  39  {
58e0166a Jonas Bonn  2011-06-04  40  	return __ioremap(offset, size, PAGE_KERNEL);
58e0166a Jonas Bonn  2011-06-04  41  }
58e0166a Jonas Bonn  2011-06-04  42  
58e0166a Jonas Bonn  2011-06-04  43  /* #define _PAGE_CI       0x002 */
58e0166a Jonas Bonn  2011-06-04 @44  static inline void __iomem *ioremap_nocache(phys_addr_t offset,
58e0166a Jonas Bonn  2011-06-04  45  					     unsigned long size)
58e0166a Jonas Bonn  2011-06-04  46  {
58e0166a Jonas Bonn  2011-06-04  47  	return __ioremap(offset, size,
58e0166a Jonas Bonn  2011-06-04  48  			 __pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_CI));
58e0166a Jonas Bonn  2011-06-04  49  }
58e0166a Jonas Bonn  2011-06-04  50  

:::::: The code at line 38 was first introduced by commit
:::::: 58e0166a4772aaeb10c9b0f6d59f19099d2047df OpenRISC: Headers

:::::: TO: Jonas Bonn <jonas@...thpole.se>
:::::: CC: Jonas Bonn <jonas@...thpole.se>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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