[kbuild:kbuild 2/4] arch/openrisc/include/asm/spr.h:20:27: error: impossible constraint in 'asm'

[kbuild test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git kbuild
head:   e73c4f947acbe6ff12d1f1711d6a8c0ad1c9483a
commit: cc2b86bb90b2d045b82d45a6dbe7c9285e0f00b9 [2/4] kernel hacking: add a config option to disable compiler auto-inlining
config: openrisc-allyesconfig (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
        git checkout cc2b86bb90b2d045b82d45a6dbe7c9285e0f00b9
        # save the attached .config to linux build tree
        make.cross ARCH=openrisc 

All errors (new ones prefixed by >>):

   In file included from arch/openrisc/mm/cache.c:17:0:
   arch/openrisc/mm/cache.c: In function 'cache_loop':
   arch/openrisc/include/asm/spr.h:20:27: warning: asm operand 0 probably doesn't match constraints
    #define mtspr(_spr, _val) __asm__ __volatile__ (  \
                              ^
   arch/openrisc/mm/cache.c:29:3: note: in expansion of macro 'mtspr'
      mtspr(reg, line);
      ^~~~~
>> arch/openrisc/include/asm/spr.h:20:27: error: impossible constraint in 'asm'
    #define mtspr(_spr, _val) __asm__ __volatile__ (  \
                              ^
   arch/openrisc/mm/cache.c:29:3: note: in expansion of macro 'mtspr'
      mtspr(reg, line);
      ^~~~~

vim +/asm +20 arch/openrisc/include/asm/spr.h

58e0166a4 Jonas Bonn 2011-06-04  19  
58e0166a4 Jonas Bonn 2011-06-04 @20  #define mtspr(_spr, _val) __asm__ __volatile__ (		\
58e0166a4 Jonas Bonn 2011-06-04  21  	"l.mtspr r0,%1,%0"					\
58e0166a4 Jonas Bonn 2011-06-04  22  	: : "K" (_spr), "r" (_val))
58e0166a4 Jonas Bonn 2011-06-04  23  #define mtspr_off(_spr, _off, _val) __asm__ __volatile__ (	\
58e0166a4 Jonas Bonn 2011-06-04  24  	"l.mtspr %0,%1,%2"					\
58e0166a4 Jonas Bonn 2011-06-04  25  	: : "r" (_off), "r" (_val), "K" (_spr))
58e0166a4 Jonas Bonn 2011-06-04  26  

:::::: The code at line 20 was first introduced by commit
:::::: 58e0166a4772aaeb10c9b0f6d59f19099d2047df OpenRISC: Headers

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

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

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