[PATCH 1/5] powerpc/64s: Guarded Userspace Access Prevention

[kbuild test robot]

Hi Russell,

I love your patch! Yet something to improve:

[auto build test ERROR on powerpc/next]
[also build test ERROR on next-20181029]
[cannot apply to v4.19]
[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/Russell-Currey/Guarded-Userspace-Access-Prevention-on-Radix/20181026-145017
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc-ppc64e_defconfig (attached as .config)
compiler: powerpc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
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
        GCC_VERSION=7.2.0 make.cross ARCH=powerpc 

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

   In file included from arch/powerpc/kernel/asm-offsets.c:31:0:
   arch/powerpc/kernel/asm-offsets.c: In function 'main':
>> include/linux/compiler_types.h:229:35: error: 'struct paca_struct' has no member named 'user_access_allowed'
    #define __compiler_offsetof(a, b) __builtin_offsetof(a, b)
                                      ^
   include/linux/kbuild.h:6:62: note: in definition of macro 'DEFINE'
     asm volatile("\n.ascii \"->" #sym " %0 " #val "\"" : : "i" (val))
                                                                 ^~~
   include/linux/stddef.h:17:32: note: in expansion of macro '__compiler_offsetof'
    #define offsetof(TYPE, MEMBER) __compiler_offsetof(TYPE, MEMBER)
                                   ^~~~~~~~~~~~~~~~~~~
>> include/linux/kbuild.h:11:14: note: in expansion of macro 'offsetof'
     DEFINE(sym, offsetof(struct str, mem))
                 ^~~~~~~~
>> arch/powerpc/kernel/asm-offsets.c:263:2: note: in expansion of macro 'OFFSET'
     OFFSET(PACA_USER_ACCESS_ALLOWED, paca_struct, user_access_allowed);
     ^~~~~~
   make[2]: *** [arch/powerpc/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 +229 include/linux/compiler_types.h

815f0ddb Nick Desaulniers 2018-08-22  228  
815f0ddb Nick Desaulniers 2018-08-22 @229  #define __compiler_offsetof(a, b)	__builtin_offsetof(a, b)
815f0ddb Nick Desaulniers 2018-08-22  230  

:::::: The code at line 229 was first introduced by commit
:::::: 815f0ddb346c196018d4d8f8f55c12b83da1de3f include/linux/compiler*.h: make compiler-*.h mutually exclusive

:::::: TO: Nick Desaulniers <ndesaulniers at google.com>
:::::: CC: Linus Torvalds <torvalds at linux-foundation.org>

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