linux-kernel - Re: [PATCH 09/45] C++: x86: Fix the x86 syscall table production for C++

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Date:   Mon, 2 Apr 2018 15:57:46 +0800
From:   kbuild test robot <lkp@...el.com>
To:     David Howells <dhowells@...hat.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/45] C++: x86: Fix the x86 syscall table production for
 C++

Hi David,

I love your patch! Yet something to improve:

[auto build test ERROR on v4.16-rc7]
[cannot apply to linus/master tip/x86/core tip/locking/core v4.16 next-20180329]
[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/David-Howells/C-Convert-the-kernel-to-C/20180402-120344
config: um-x86_64_defconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=um SUBARCH=x86_64

All errors (new ones prefixed by >>):

   cc1: warning: command line option '-fno-rtti' is valid for C++/ObjC++ but not for C
   cc1: warning: command line option '-fpermissive' is valid for C++/ObjC++ but not for C
   In file included from arch/x86/um/user-offsets.c:20:0:
   arch/x86/include/generated/asm/syscalls_64.h:135:1: error: implicit declaration of function '__NO_SYSCALL_'; did you mean '__SYSCALL_64'? [-Werror=implicit-function-declaration]
    __NO_SYSCALL_(134)
    ^~~~~~~~~~~~~
    __SYSCALL_64
>> arch/x86/um/user-offsets.c:18:37: error: subscripted value is neither array nor pointer nor vector
    #define __SYSCALL_64(nr, sym, qual) [nr] = 1,
                                        ^
   arch/x86/include/generated/asm/syscalls_64.h:136:1: note: in expansion of macro '__SYSCALL_64'
    __SYSCALL_64(135, sys_personality, )
    ^~~~~~~~~~~~
>> arch/x86/um/user-offsets.c:18:37: error: subscripted value is neither array nor pointer nor vector
    #define __SYSCALL_64(nr, sym, qual) [nr] = 1,
                                        ^
   arch/x86/include/generated/asm/syscalls_64.h:176:1: note: in expansion of macro '__SYSCALL_64'
    __SYSCALL_64(175, sys_init_module, )
    ^~~~~~~~~~~~
   In file included from arch/x86/um/user-offsets.c:20:0:
   arch/x86/include/generated/asm/syscalls_64.h:178:1: error: initializer element is not constant
    __NO_SYSCALL_(177)
    ^~~~~~~~~~~~~
   arch/x86/include/generated/asm/syscalls_64.h:178:1: note: (near initialization for 'syscalls[177]')
   arch/x86/include/generated/asm/syscalls_64.h:179:1: error: expected '}' before '__NO_SYSCALL_'
    __NO_SYSCALL_(178)
    ^~~~~~~~~~~~~
   cc1: some warnings being treated as errors
   make[2]: *** [arch/x86/um/user-offsets.s] Error 1
   make[1]: *** [arch/x86/um/user-offsets.s] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [sub-make] Error 2

vim +18 arch/x86/um/user-offsets.c

8d0b9dc9 arch/um/sys-x86_64/user-offsets.c Al Viro         2005-05-05  11  
45db1c61 arch/x86/um/user-offsets.c        H. Peter Anvin  2011-12-05  12  #ifdef __i386__
cfcbadb4 arch/x86/um/user-offsets.c        Andy Lutomirski 2016-01-28  13  #define __SYSCALL_I386(nr, sym, qual) [nr] = 1,
45db1c61 arch/x86/um/user-offsets.c        H. Peter Anvin  2011-12-05  14  static char syscalls[] = {
45db1c61 arch/x86/um/user-offsets.c        H. Peter Anvin  2011-12-05  15  #include <asm/syscalls_32.h>
45db1c61 arch/x86/um/user-offsets.c        H. Peter Anvin  2011-12-05  16  };
45db1c61 arch/x86/um/user-offsets.c        H. Peter Anvin  2011-12-05  17  #else
cfcbadb4 arch/x86/um/user-offsets.c        Andy Lutomirski 2016-01-28 @18  #define __SYSCALL_64(nr, sym, qual) [nr] = 1,
45db1c61 arch/x86/um/user-offsets.c        H. Peter Anvin  2011-12-05  19  static char syscalls[] = {
45db1c61 arch/x86/um/user-offsets.c        H. Peter Anvin  2011-12-05 @20  #include <asm/syscalls_64.h>
45db1c61 arch/x86/um/user-offsets.c        H. Peter Anvin  2011-12-05  21  };
45db1c61 arch/x86/um/user-offsets.c        H. Peter Anvin  2011-12-05  22  #endif
45db1c61 arch/x86/um/user-offsets.c        H. Peter Anvin  2011-12-05  23  

:::::: The code at line 18 was first introduced by commit
:::::: cfcbadb49dabb05efa23e1a0f95f3391c0a815bc x86/syscalls: Add syscall entry qualifiers

:::::: TO: Andy Lutomirski <luto@...nel.org>
:::::: CC: Ingo Molnar <mingo@...nel.org>

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